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christopher
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oeis

Dataset card Data Studio Files
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timestamp[us]date
1999-12-11 03:00:00
2025-04-25 01:21:50
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32
A001301
Number of ways of making change for n cents using coins of 1, 2, 5, 10, 25 cents.
[ "1", "1", "2", "2", "3", "4", "5", "6", "7", "8", "11", "12", "15", "16", "19", "22", "25", "28", "31", "34", "40", "43", "49", "52", "58", "65", "71", "78", "84", "91", "102", "109", "120", "127", "138", "151", "162", "175", "186", "199", "217", "230", "248", "261", "279", "300", "318", "339", "357", "378", "406", "427", "455", "476", "504", "536", "564", "596", "624", "656" ]
[ "nonn" ]
41
0
5
null
null
N. J. A. Sloane
2021-12-19T09:55:17
oeisdata/seq/A001/A001301.seq
af4aa9ce2863e36918f56008e59e99c7
A001302
Number of ways of making change for n cents using coins of 1, 2, 5, 10, 25, 50 cents.
[ "1", "1", "2", "2", "3", "4", "5", "6", "7", "8", "11", "12", "15", "16", "19", "22", "25", "28", "31", "34", "40", "43", "49", "52", "58", "65", "71", "78", "84", "91", "102", "109", "120", "127", "138", "151", "162", "175", "186", "199", "217", "230", "248", "261", "279", "300", "318", "339", "357", "378", "407", "428", "457", "478", "507", "540", "569", "602", "631", "664" ]
[ "nonn" ]
46
0
5
null
null
N. J. A. Sloane
2021-06-05T22:07:35
oeisdata/seq/A001/A001302.seq
06a4b3c7f60f0cce0f7a1177bba3f257
A001303
Stirling numbers of first kind, s(n+3, n), negated.
[ "6", "50", "225", "735", "1960", "4536", "9450", "18150", "32670", "55770", "91091", "143325", "218400", "323680", "468180", "662796", "920550", "1256850", "1689765", "2240315", "2932776", "3795000", "4858750", "6160050", "7739550", "9642906", "11921175", "14631225", "17836160", "21605760", "26016936", "31154200" ]
[ "nonn", "easy" ]
92
0
5
[ "A000217", "A001297", "A001303", "A008275" ]
[ "M4258", "N1779" ]
N. J. A. Sloane
2022-10-21T21:57:59
oeisdata/seq/A001/A001303.seq
d99ceaa53c8e32a5237c2cf1d5d3abb5
A001304
Expansion of 1/((1-x)^2*(1-x^2)*(1-x^5)).
[ "1", "2", "4", "6", "9", "13", "18", "24", "31", "39", "49", "60", "73", "87", "103", "121", "141", "163", "187", "213", "242", "273", "307", "343", "382", "424", "469", "517", "568", "622", "680", "741", "806", "874", "946", "1022", "1102", "1186", "1274", "1366", "1463", "1564", "1670", "1780", "1895", "2015", "2140", "2270", "2405", "2545", "2691", "2842" ]
[ "nonn", "easy" ]
38
0
5
[ "A000115", "A001304" ]
null
N. J. A. Sloane
2022-02-03T00:33:10
oeisdata/seq/A001/A001304.seq
880231f8cd224fe37b89466c9c5718df
A001305
Expansion of 1/((1-x)^2*(1-x^2)*(1-x^5)*(1-x^10)*(1-x^20)).
[ "1", "2", "4", "6", "9", "13", "18", "24", "31", "39", "50", "62", "77", "93", "112", "134", "159", "187", "218", "252", "293", "337", "388", "442", "503", "571", "646", "728", "817", "913", "1022", "1138", "1267", "1403", "1552", "1714", "1889", "2077", "2278", "2492", "2728", "2977", "3248", "3532", "3838", "4166", "4516", "4888", "5282", "5698", "6148" ]
[ "nonn", "easy" ]
31
0
5
null
null
N. J. A. Sloane
2017-04-18T07:02:35
oeisdata/seq/A001/A001305.seq
2754d14ff3265a53b687666d1361b544
A001306
Number of ways of making change for n cents using coins of 1, 5, 10, 20, 50, 100 cents.
[ "1", "1", "1", "1", "1", "2", "2", "2", "2", "2", "4", "4", "4", "4", "4", "6", "6", "6", "6", "6", "10", "10", "10", "10", "10", "14", "14", "14", "14", "14", "20", "20", "20", "20", "20", "26", "26", "26", "26", "26", "35", "35", "35", "35", "35", "44", "44", "44", "44", "44", "57", "57", "57", "57", "57", "70", "70", "70", "70", "70", "88", "88", "88", "88", "88", "106", "106", "106", "106" ]
[ "nonn" ]
30
0
5
null
null
N. J. A. Sloane
2022-02-03T00:33:24
oeisdata/seq/A001/A001306.seq
dd369846fd051da37c3aa9050418178d
A001307
Expansion of 1/(1-x)^2/(1-x^2)/(1-x^4)/(1-x^10)/(1-x^20).
[ "1", "2", "4", "6", "10", "14", "20", "26", "35", "44", "57", "70", "88", "106", "130", "154", "185", "216", "255", "294", "344", "394", "456", "518", "595", "672", "765", "858", "970", "1082", "1216", "1350", "1509", "1668", "1855", "2042", "2260", "2478", "2730", "2982", "3274", "3566", "3901", "4236", "4620", "5004", "5440", "5876", "6370", "6864" ]
[ "nonn", "easy" ]
34
0
5
null
null
N. J. A. Sloane
2022-02-03T00:33:41
oeisdata/seq/A001/A001307.seq
8d2b75eda6cfadfdd6e015522fdd107a
A001308
Order of Chevalley group D_n (2).
[ "1", "36", "20160", "174182400", "23499295948800", "50027557148216524800", "1691555775522928280469504000", "911666827031785075278550369566720000", "7846393898179181843651374899795632943267840000" ]
[ "nonn", "easy" ]
10
0
5
[ "A001308", "A003923" ]
null
N. J. A. Sloane
2024-06-14T22:31:08
oeisdata/seq/A001/A001308.seq
87d90c9f1761fa3353226488afcda475
A001309
Order of real Clifford group L_n connected with Barnes-Wall lattices in dimension 2^n.
[ "2", "16", "2304", "5160960", "178362777600", "96253116206284800", "819651496316379542323200", "110857799304670627788849414144000", "238987988705420266773820308079698247680000" ]
[ "nonn", "easy", "nice" ]
27
0
5
[ "A001308", "A001309", "A003956", "A014115", "A014116" ]
null
N. J. A. Sloane, Peter Shor
2022-06-21T03:15:06
oeisdata/seq/A001/A001309.seq
f3a8e6a4da682742dafe15acbedbff99
A001310
Number of ways of making change for n cents using coins of 1, 2, 4, 10, 20, 40, 100 cents.
[ "1", "1", "2", "2", "4", "4", "6", "6", "9", "9", "13", "13", "18", "18", "24", "24", "31", "31", "39", "39", "50", "50", "62", "62", "77", "77", "93", "93", "112", "112", "134", "134", "159", "159", "187", "187", "218", "218", "252", "252", "293", "293", "337", "337", "388", "388", "442", "442", "503", "503", "571", "571", "646", "646", "728", "728", "817", "817", "913" ]
[ "nonn" ]
35
0
5
null
null
N. J. A. Sloane
2022-02-01T01:28:47
oeisdata/seq/A001/A001310.seq
ebc51aad5f3febe2152cda7365086795
A001311
Final 2 digits of 6^n.
[ "1", "6", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96", "76", "56", "36", "16", "96" ]
[ "nonn", "easy" ]
22
0
5
null
null
N. J. A. Sloane
2022-09-08T08:44:29
oeisdata/seq/A001/A001311.seq
69ba2c7118c8e9f6657b8aafd91218b0
A001312
Number of ways of making change for n cents using coins of 1, 2, 5, 10, 50, 100 cents.
[ "1", "1", "2", "2", "3", "4", "5", "6", "7", "8", "11", "12", "15", "16", "19", "22", "25", "28", "31", "34", "40", "43", "49", "52", "58", "64", "70", "76", "82", "88", "98", "104", "114", "120", "130", "140", "150", "160", "170", "180", "195", "205", "220", "230", "245", "260", "275", "290", "305", "320", "342", "357", "379", "394", "416", "438", "460", "482", "504", "526" ]
[ "nonn", "easy" ]
35
0
5
null
null
N. J. A. Sloane
2022-02-01T01:29:26
oeisdata/seq/A001/A001312.seq
89bc09574de116f5cfae154ed53e9ca5
A001313
Number of ways of making change for n cents using coins of 1, 2, 5, 10, 20, 50 cents.
[ "1", "1", "2", "2", "3", "4", "5", "6", "7", "8", "11", "12", "15", "16", "19", "22", "25", "28", "31", "34", "41", "44", "51", "54", "61", "68", "75", "82", "89", "96", "109", "116", "129", "136", "149", "162", "175", "188", "201", "214", "236", "249", "271", "284", "306", "328", "350", "372", "394", "416", "451", "473", "508", "530", "565", "600", "635", "670", "705", "740" ]
[ "nonn", "easy" ]
37
0
5
[ "A001313", "A001319" ]
null
N. J. A. Sloane
2022-02-01T01:29:45
oeisdata/seq/A001/A001313.seq
b5038786e4e095153eaf64c849cb3ba4
A001314
Number of (unordered) ways of making change for n cents using coins of 2, 5 (two kinds), 10, 20, 50 cents.
[ "1", "0", "1", "0", "1", "2", "1", "2", "1", "2", "5", "2", "5", "2", "5", "8", "5", "8", "5", "8", "15", "8", "15", "8", "15", "22", "15", "22", "15", "22", "35", "22", "35", "22", "35", "48", "35", "48", "35", "48", "70", "48", "70", "48", "70", "92", "70", "92", "70", "92", "127", "92", "127", "92", "127", "162", "127", "162", "127", "162", "215", "162", "215", "162", "215", "268" ]
[ "nonn" ]
30
0
5
null
null
N. J. A. Sloane
2023-09-23T16:46:00
oeisdata/seq/A001/A001314.seq
6294a333c18dc0fe44d6e0e7b9a5b246
A001315
a(n) = Sum_{k=0..n} 2^binomial(n,k).
[ "2", "4", "8", "20", "100", "2116", "1114244", "68723671300", "1180735735906024030724", "170141183460507917357914971986913657860" ]
[ "nonn" ]
19
0
5
null
[ "M1158", "N0441" ]
N. J. A. Sloane
2022-02-03T02:31:33
oeisdata/seq/A001/A001315.seq
c618fcfa10949519e4d7083181b5246a
A001316
Gould's sequence: a(n) = Sum_{k=0..n} (binomial(n,k) mod 2); number of odd entries in row n of Pascal's triangle (A007318); a(n) = 2^A000120(n).
[ "1", "2", "2", "4", "2", "4", "4", "8", "2", "4", "4", "8", "4", "8", "8", "16", "2", "4", "4", "8", "4", "8", "8", "16", "4", "8", "8", "16", "8", "16", "16", "32", "2", "4", "4", "8", "4", "8", "8", "16", "4", "8", "8", "16", "8", "16", "16", "32", "4", "8", "8", "16", "8", "16", "16", "32", "8", "16", "16", "32", "16", "32", "32", "64", "2", "4", "4", "8", "4", "8", "8", "16", "4", "8", "8", "16", "8", "16", "16", "32", "4", "8", "8", "16", "8", "16", "16", "32" ]
[ "nonn", "easy", "nice", "changed" ]
350
0
5
[ "A000012", "A000027", "A000079", "A000695", "A001316", "A005836", "A006046", "A006047", "A007318", "A008977", "A033042", "A037445", "A038573", "A039966", "A047999", "A048883", "A048896", "A048967", "A049606", "A051638", "A061142", "A089898", "A094959", "A102376", "A105321", "A117940", "A117973", "A139541", "A151665", "A151666", "A151667", "A151668", "A151669", "A151670", "A151671", "A151672", "A151673", "A151674", "A151930", "A159913", "A163000", "A163577", "A166548", "A261363", "A261366", "A275012", "A286575", "A368655" ]
[ "M0297", "N0109" ]
N. J. A. Sloane
2025-04-23T20:11:36
oeisdata/seq/A001/A001316.seq
3a4dfc674a6ca1eaac5b6a4e88d76f8a
A001317
Sierpiński's triangle (Pascal's triangle mod 2) converted to decimal.
[ "1", "3", "5", "15", "17", "51", "85", "255", "257", "771", "1285", "3855", "4369", "13107", "21845", "65535", "65537", "196611", "327685", "983055", "1114129", "3342387", "5570645", "16711935", "16843009", "50529027", "84215045", "252645135", "286331153", "858993459", "1431655765", "4294967295", "4294967297", "12884901891", "21474836485", "64424509455", "73014444049", "219043332147", "365072220245", "1095216660735", "1103806595329", "3311419785987" ]
[ "nonn", "base", "easy", "nice", "hear" ]
302
0
5
[ "A000079", "A000215", "A001317", "A038183", "A045544", "A047999", "A048720", "A048723", "A048724", "A053576", "A054432", "A173019", "A177882", "A177897", "A177960", "A193231", "A230116", "A247282", "A249184", "A268384", "A268389", "A268391", "A268669" ]
[ "M2495", "N0988" ]
N. J. A. Sloane
2025-02-16T08:32:23
oeisdata/seq/A001/A001317.seq
e2eb40a18ab5e6ed6abf3ff486b5aaaf
A001318
Generalized pentagonal numbers: m*(3*m - 1)/2, m = 0, +-1, +-2, +-3, ....
[ "0", "1", "2", "5", "7", "12", "15", "22", "26", "35", "40", "51", "57", "70", "77", "92", "100", "117", "126", "145", "155", "176", "187", "210", "222", "247", "260", "287", "301", "330", "345", "376", "392", "425", "442", "477", "495", "532", "551", "590", "610", "651", "672", "715", "737", "782", "805", "852", "876", "925", "950", "1001", "1027", "1080", "1107", "1162", "1190", "1247", "1276", "1335" ]
[ "nonn", "easy", "nice", "changed" ]
583
0
5
[ "A000217", "A000326", "A001082", "A001318", "A002620", "A005449", "A007310", "A010815", "A026741", "A033568", "A033570", "A034828", "A036498", "A036499", "A049452", "A049453", "A054440", "A057569", "A057570", "A068052", "A074377", "A074378", "A080995", "A085787", "A101688", "A118277", "A153384", "A165211", "A168258", "A174739", "A175005", "A195152", "A195160", "A195162", "A195313", "A195818", "A218864", "A221671", "A221672", "A260664", "A260672", "A274978", "A274979", "A277082", "A303298", "A303299", "A303303", "A303304", "A303305", "A303812", "A303813", "A303814", "A303815", "A316724", "A316725", "A316729" ]
[ "M1336", "N0511" ]
N. J. A. Sloane
2025-04-19T19:36:39
oeisdata/seq/A001/A001318.seq
595b54c0065a79a37dd271ee44750ca3
A001319
Number of (unordered) ways of making change for n cents using coins of 2, 5, 10, 20, 50 cents.
[ "1", "0", "1", "0", "1", "1", "1", "1", "1", "1", "3", "1", "3", "1", "3", "3", "3", "3", "3", "3", "7", "3", "7", "3", "7", "7", "7", "7", "7", "7", "13", "7", "13", "7", "13", "13", "13", "13", "13", "13", "22", "13", "22", "13", "22", "22", "22", "22", "22", "22", "35", "22", "35", "22", "35", "35", "35", "35", "35", "35", "53", "35", "53", "35", "53", "53", "53", "53", "53", "53", "77", "53", "77" ]
[ "nonn" ]
32
0
5
[ "A001313", "A001319" ]
null
N. J. A. Sloane
2022-02-01T01:30:31
oeisdata/seq/A001/A001319.seq
234b54de57c42a46a78b345636d19364
A001320
Number of self-complementary Boolean functions of n variables, up to equivalence under the group (C_2)^n of all 2^n complementations of variables.
[ "1", "3", "14", "240", "63488", "4227858432", "18302628885633695744", "338953138925153547590470800371487866880", "115565932813024562229384322928592814283244066726840484812818018414147674308608" ]
[ "nonn", "easy", "nice", "changed" ]
34
0
5
[ "A000610", "A001320" ]
[ "M2982", "N1204" ]
N. J. A. Sloane
2025-04-18T08:44:05
oeisdata/seq/A001/A001320.seq
23e79f76fddb786356fed1226347c6d2
A001321
Number of equivalence classes of 3-valued Post functions of n variables under action of symmetric group S_n.
[ "27", "10206", "1271126683458", "18476103676807778218052102700370958034", "726580354049674651690925588215506430824419524245730549989258760312370548741057559799467925374036936715660160424670" ]
[ "nonn" ]
25
0
5
[ "A001321", "A001323", "A056668" ]
[ "M5196", "N2260" ]
N. J. A. Sloane
2023-06-04T15:11:14
oeisdata/seq/A001/A001321.seq
964f9947532780585a7c4e3432bb961b
A001322
Number of equivalence classes of n-valued Post functions of 2 variables under action of symmetric group S_2.
[ "12", "10206", "2148007936", "149011627197265625", "5157212399256236248406163456", "128461788760529439274299006884487791149204", "3138550867693340381917894873863110037264541113810027544576" ]
[ "nonn" ]
18
0
5
[ "A001321", "A001322", "A003180" ]
[ "M4884", "N2094" ]
N. J. A. Sloane
2024-05-19T12:44:24
oeisdata/seq/A001/A001322.seq
f95f92416cb259ec1dca41a03a6e383d
A001323
Number of equivalence classes of 3-valued Post functions of n variables under action of semi-direct product of symmetric group S_n and complementing group C(n,3).
[ "11", "1230", "47093135946", "228100045393047605442978104423211474", "2990042609257920377328911885660520291593377363477428617527885840940251334510092369981274334727707712945234812750" ]
[ "nonn" ]
18
0
5
[ "A000616", "A001323", "A001324" ]
[ "M4815", "N2060" ]
N. J. A. Sloane
2024-05-19T12:46:03
oeisdata/seq/A001/A001323.seq
d2af7ea2d3172bbec1f102efbf0fc4c1
A001324
Number of equivalence classes of n-valued Post functions of 2 variables under action of semi-direct product of symmetric group S_2 and complementing group C(2,n).
[ "6", "1230", "134355076", "5960467529298425", "143255899980867527046714276", "2621669158378151850086910541198116201940", "49039857307708443467467125153076407586398190249948742656" ]
[ "nonn" ]
18
0
5
[ "A000616", "A001323", "A001324" ]
[ "M4316", "N1808" ]
N. J. A. Sloane
2024-05-19T12:44:00
oeisdata/seq/A001/A001324.seq
085b11c51df91cd5ac5ad6d76a4b996b
A001325
Number of equivalence classes of 3-valued Post functions of n variables under action of semi-direct product of symmetric group S_n and complementing group D(n,3).
[ "18", "2862", "158942078604", "1154756479802000759397882239648671476", "22705636064052332865341424631734575964031184548599980511689123743695605536329597356626173372044993289352573124700" ]
[ "nonn" ]
23
0
5
null
[ "M5065", "N2193" ]
N. J. A. Sloane
2024-05-19T12:44:37
oeisdata/seq/A001/A001325.seq
6df07c9ee7a7a1447c25e978411839ff
A001326
Number of equivalence classes of n-valued Post functions of 2 variables under action of semi-direct product of symmetric group S_2 and complementing group D(2,n).
[ "6", "2862", "537157696", "37252918396015625", "1289303099816839265917858176", "32115447190132359991237336502881651018804", "784637716923335095479473759060307277562325323313332617216", "24578381309444114202259488565864018899536000344974197975371115039374528219929" ]
[ "nonn" ]
22
0
5
null
[ "M4317", "N1809" ]
N. J. A. Sloane
2024-05-19T12:45:54
oeisdata/seq/A001/A001326.seq
f9fbf453425c1cf3979dc106926b5b21
A001327
Number of equivalence classes of 3-valued Post functions of n variables under action of semi-direct product of symmetric groups S_n and S(n,3).
[ "10", "438", "5893028544", "14256252837121596073801515513052992", "93438831539310011791528496426891259121775442805243046889607091562337477169707144501052634950477913975318905688" ]
[ "nonn" ]
20
0
5
null
[ "M4753", "N2034" ]
N. J. A. Sloane
2015-10-31T15:17:36
oeisdata/seq/A001/A001327.seq
5bdd1c8a4724cca2c398b54e1d4c353b
A001328
Number of equivalence classes of n-valued Post functions of 2 variables under action of semi-direct product of symmetric groups S_2 and S(2,n).
[ "6", "438", "3962646", "10417184196975", "9954761196199929077325", "5057490251219818192322424165975972", "1930587876541100645614895805509354549563927698736", "746598793682620583344610283857629170831782164188262315836348333960" ]
[ "nonn" ]
25
0
5
[ "A001324", "A001328" ]
[ "M4309", "N1804" ]
N. J. A. Sloane
2015-11-03T17:15:04
oeisdata/seq/A001/A001328.seq
5ebca29382f950db4dbd03cb5e90061d
A001329
Number of nonisomorphic groupoids with n elements.
[ "1", "1", "10", "3330", "178981952", "2483527537094825", "14325590003318891522275680", "50976900301814584087291487087214170039", "155682086691137947272042502251643461917498835481022016" ]
[ "nonn", "nice" ]
127
0
5
[ "A001329", "A001424", "A001425", "A002489", "A006448", "A029850", "A030245", "A030265", "A030271", "A038015", "A038023" ]
[ "M4760", "N2035" ]
N. J. A. Sloane
2025-02-16T08:32:23
oeisdata/seq/A001/A001329.seq
e28d8d18830d12f589bc3f99c639bbbd
A001330
Number of n-element algebras with 2 binary operations.
[ "1", "1", "136", "64573605", "768614338015543296", "740148683083442627372862307855625", "147760220727384062234340471228346859265417269763446784", "13097167596472133103922286145973062271265962292695709182416029922453889335720758" ]
[ "nonn" ]
24
0
5
[ "A001329", "A001330", "A001331" ]
[ "M5398", "N2346" ]
N. J. A. Sloane
2021-12-19T14:00:43
oeisdata/seq/A001/A001330.seq
d135b6ccc9f16cbbdefbb6921135c261
A001331
Number of n-element algebras with 1 ternary operation.
[ "1", "130", "1270932917454", "14178431955039102644307345678938144832", "19591572513704791799478942287037427963644425946432640042160816616766795992851260047500", "1672390093955882094725125078968449171301017629802018367164057251590306327375884442617701277598562886114475651122751129803783336384871488080121922759032559677888042592" ]
[ "nonn", "nice" ]
23
0
5
[ "A001331", "A091510" ]
[ "M5395", "N2344" ]
N. J. A. Sloane.
2019-05-29T10:07:53
oeisdata/seq/A001/A001331.seq
597e3f1139ebbb4867dcc8918e10e73f
A001332
a(n) = Bernoulli(2*n) * (2*n + 1)!.
[ "1", "1", "-4", "120", "-12096", "3024000", "-1576143360", "1525620096000", "-2522591034163200", "6686974460694528000", "-27033456071346536448000", "160078872315904478576640000", "-1342964491649083924630732800000", "15522270327163593186886877184000000" ]
[ "sign", "nice" ]
31
0
5
[ "A001332", "A129814" ]
[ "M3710", "N1516" ]
N. J. A. Sloane
2023-01-19T11:09:57
oeisdata/seq/A001/A001332.seq
46d0052a500615c4651be77c1252e795
A001333
Pell-Lucas numbers: numerators of continued fraction convergents to sqrt(2).
[ "1", "1", "3", "7", "17", "41", "99", "239", "577", "1393", "3363", "8119", "19601", "47321", "114243", "275807", "665857", "1607521", "3880899", "9369319", "22619537", "54608393", "131836323", "318281039", "768398401", "1855077841", "4478554083", "10812186007", "26102926097", "63018038201", "152139002499", "367296043199" ]
[ "nonn", "cofr", "easy", "core", "nice", "frac" ]
559
0
5
[ "A000129", "A000217", "A000225", "A001333", "A001906", "A001911", "A002203", "A002478", "A002532", "A002533", "A002605", "A002965", "A003945", "A006356", "A015518", "A015519", "A026150", "A028859", "A033303", "A033539", "A034182", "A040000", "A046717", "A048211", "A048624", "A052542", "A052937", "A053120", "A054458", "A055099", "A063727", "A078057", "A083098", "A083099", "A083100", "A084057", "A084128", "A086395", "A088305", "A095263", "A106513", "A135597", "A135837", "A140750", "A152113", "A153588", "A160756", "A174283", "A174284", "A174285", "A174286", "A176499", "A176500", "A176501", "A176502", "A214260", "A293004", "A332602" ]
[ "M2665", "N1064" ]
N. J. A. Sloane, R. K. Guy
2025-03-16T08:18:16
oeisdata/seq/A001/A001333.seq
bf8cb11424f2ba81f42aead53be77b36
A001334
Number of n-step self-avoiding walks on hexagonal [ =triangular ] lattice.
[ "1", "6", "30", "138", "618", "2730", "11946", "51882", "224130", "964134", "4133166", "17668938", "75355206", "320734686", "1362791250", "5781765582", "24497330322", "103673967882", "438296739594", "1851231376374", "7812439620678", "32944292555934", "138825972053046" ]
[ "nonn", "walk", "nice" ]
65
0
5
[ "A001334", "A001335", "A001336", "A001411", "A001412", "A001666", "A036418", "A192208" ]
[ "M4197", "N1751" ]
N. J. A. Sloane
2021-05-13T11:30:15
oeisdata/seq/A001/A001334.seq
e75a7774678a1db5d604b34ddaf4422a
A001335
Number of n-step polygons on hexagonal lattice.
[ "1", "0", "0", "12", "24", "60", "180", "588", "1968", "6840", "24240", "87252", "318360", "1173744", "4366740", "16370700", "61780320", "234505140", "894692736", "3429028116", "13195862760", "50968206912", "197517813636", "767766750564", "2992650987408", "11694675166500", "45807740881032" ]
[ "nonn", "nice", "walk", "more" ]
46
0
5
[ "A001334", "A001335", "A003289" ]
[ "M4828", "N2065" ]
N. J. A. Sloane
2020-05-16T03:51:49
oeisdata/seq/A001/A001335.seq
a02adc6f9a4b89bf603a96b546006815
A001336
Number of n-step self-avoiding walks on f.c.c. lattice.
[ "1", "12", "132", "1404", "14700", "152532", "1573716", "16172148", "165697044", "1693773924", "17281929564", "176064704412", "1791455071068", "18208650297396", "184907370618612", "1876240018679868", "19024942249966812", "192794447005403916", "1952681556794601732", "19767824914170222996" ]
[ "nonn", "walk", "nice" ]
46
0
5
[ "A001334", "A001336", "A001337", "A001411", "A001412", "A001666" ]
[ "M4867", "N2082" ]
N. J. A. Sloane
2023-07-25T19:27:01
oeisdata/seq/A001/A001336.seq
ef60a46b534952940b2bd189b1eebcaa
A001337
Number of n-step polygons on f.c.c. lattice.
[ "0", "0", "48", "264", "1680", "11640", "86352", "673104", "5424768", "44828400", "377810928", "3235366752", "28074857616", "246353214240", "2182457514960", "19495053028800", "175405981214592" ]
[ "nonn", "nice", "walk", "more" ]
34
0
5
[ "A001336", "A001337", "A003287", "A005398" ]
[ "M5293", "N2302" ]
N. J. A. Sloane
2019-01-15T02:47:45
oeisdata/seq/A001/A001337.seq
717a3dd51229070657c8d9b4c64840ff
A001338
-1 + Sum (k-1)! C(n,k), k = 1..n for n > 0, a(0) = 1.
[ "1", "0", "2", "7", "23", "88", "414", "2371", "16071", "125672", "1112082", "10976183", "119481295", "1421542640", "18348340126", "255323504931", "3809950977007", "60683990530224", "1027542662934914", "18430998766219335", "349096664728623335", "6962409983976703336", "145841989688186383358" ]
[ "nonn" ]
27
0
5
[ "A000522", "A001338", "A002104" ]
[ "M1759", "N0697" ]
N. J. A. Sloane
2014-12-24T23:02:06
oeisdata/seq/A001/A001338.seq
954a832dcac48897c05eb83b89fdb371
A001339
a(n) = Sum_{k=0..n} (k+1)! binomial(n,k).
[ "1", "3", "11", "49", "261", "1631", "11743", "95901", "876809", "8877691", "98641011", "1193556233", "15624736141", "220048367319", "3317652307271", "53319412081141", "909984632851473", "16436597430879731", "313262209859119579", "6282647653285676001", "132266266384961600021", "2916471173788403280463" ]
[ "nonn", "changed" ]
216
0
5
[ "A000522", "A001339", "A001563", "A006183", "A007526", "A026243", "A036918", "A064618", "A073591", "A089900", "A136104", "A137594", "A276588" ]
[ "M2901", "N1164" ]
N. J. A. Sloane
2025-04-21T13:24:04
oeisdata/seq/A001/A001339.seq
0aaab23acd4a9e3eda57ce95565cb24b
A001340
E.g.f.: 2*exp(x)/(1-x)^3.
[ "2", "8", "38", "212", "1370", "10112", "84158", "780908", "8000882", "89763320", "1094915222", "14431179908", "204423631178", "3097603939952", "50001759773870", "856665220770332", "15526612798028258", "296825612428239848", "5969385443426556422", "125983618731675924020", "2784204907403441680442" ]
[ "nonn", "easy" ]
44
0
5
null
[ "M1858", "N0736" ]
N. J. A. Sloane and Simon Plouffe
2017-06-30T08:49:38
oeisdata/seq/A001/A001340.seq
ddd5198eac9cc68e3c2c41f19c4612a4
A001341
Expansion of e.g.f. 6*exp(x)/(1-x)^4.
[ "6", "30", "174", "1158", "8742", "74046", "696750", "7219974", "81762438", "1005151902", "13336264686", "189992451270", "2893180308774", "46904155833918", "806663460996462", "14669947577257926", "281298999630211590", "5672559830998316574", "120014233288249367598", "2658221288671765756422" ]
[ "nonn" ]
49
0
5
[ "A001341", "A095000" ]
[ "M4205", "N1755" ]
N. J. A. Sloane and Simon Plouffe
2025-01-17T09:42:51
oeisdata/seq/A001/A001341.seq
a0f4e71ef9b49748c635375bffcf0024
A001342
E.g.f.: 24*exp(x)/(1-x)^5.
[ "24", "144", "984", "7584", "65304", "622704", "6523224", "74542464", "923389464", "12331112784", "176656186584", "2703187857504", "44010975525144", "759759305162544", "13863284116261464", "266629052052953664", "5391260831368104984", "114341673457251051024", "2538207055383516388824" ]
[ "nonn" ]
33
0
5
[ "A001342", "A095177" ]
[ "M5147", "N2233" ]
N. J. A. Sloane and Simon Plouffe
2022-12-21T04:44:55
oeisdata/seq/A001/A001342.seq
0e3598655f4c01f3ee40324de2cb62e5
A001343
Number of (unordered) ways of making change for n cents using coins of 5, 10, 20, 50, 100 cents.
[ "1", "0", "0", "0", "0", "1", "0", "0", "0", "0", "2", "0", "0", "0", "0", "2", "0", "0", "0", "0", "4", "0", "0", "0", "0", "4", "0", "0", "0", "0", "6", "0", "0", "0", "0", "6", "0", "0", "0", "0", "9", "0", "0", "0", "0", "9", "0", "0", "0", "0", "13", "0", "0", "0", "0", "13", "0", "0", "0", "0", "18", "0", "0", "0", "0", "18", "0", "0", "0", "0", "24", "0", "0", "0", "0", "24", "0", "0", "0", "0", "31", "0", "0", "0", "0" ]
[ "nonn" ]
37
0
5
null
null
N. J. A. Sloane, Simon Plouffe
2017-04-18T07:02:36
oeisdata/seq/A001/A001343.seq
ea934a9db11fd1d4d3bbd3379873df38
A001344
a(n) = Sum_{k=0..2} (n+k)! * C(2,k).
[ "2", "5", "11", "38", "174", "984", "6600", "51120", "448560", "4394880", "47537280", "562464000", "7224940800", "100111334400", "1488257971200", "23625316915200", "398840682240000", "7134671351808000", "134805535248384000", "2682594582700032000", "56078391288471552000", "1228615514129203200000" ]
[ "nonn", "easy" ]
40
0
5
[ "A000142", "A001344", "A007623", "A028387", "A276588", "A276955", "A336600" ]
[ "M1405", "N0548" ]
N. J. A. Sloane
2023-12-11T14:52:08
oeisdata/seq/A001/A001344.seq
09bb90c3503473d6810f37277a97ed0e
A001345
a(n) = Sum_{k = 0..3} (n+k)! C(3,k).
[ "7", "16", "49", "212", "1158", "7584", "57720", "499680", "4843440", "51932160", "610001280", "7787404800", "107336275200", "1588369305600", "25113574886400", "422465999155200", "7533512034048000", "141940206600192000", "2817400117948416000", "58760985871171584000", "1284693905417674752000" ]
[ "easy", "nonn" ]
29
0
5
[ "A001345", "A001346", "A001347" ]
[ "M4352", "N1822" ]
N. J. A. Sloane
2022-02-01T01:32:05
oeisdata/seq/A001/A001345.seq
a9d0250bc9da08d48b5db4f51889643c
A001346
a(n) = Sum_{k = 0..4} (n+k)! C(4,k).
[ "23", "65", "261", "1370", "8742", "65304", "557400", "5343120", "56775600", "661933440", "8397406080", "115123680000", "1695705580800", "26701944192000", "447579574041600", "7955978033203200", "149473718634240000", "2959340324548608000", "61578385989120000000", "1343454891288846336000" ]
[ "nonn" ]
25
0
5
[ "A001345", "A001346", "A001347" ]
[ "M5134", "N2225" ]
N. J. A. Sloane
2022-02-01T01:32:20
oeisdata/seq/A001/A001346.seq
3a36039295ff97b8a2d5a91032e4eda8
A001347
a(n) = Sum_{k=0..5} (n+k)! * C(5,k).
[ "88", "326", "1631", "10112", "74046", "622704", "5900520", "62118720", "718709040", "9059339520", "123521086080", "1810829260800", "28397649772800", "474281518233600", "8403557607244800", "157429696667443200", "3108814043182848000", "64537726313668608000", "1405033277277966336000" ]
[ "nonn" ]
22
0
5
null
[ "M5361", "N2328" ]
N. J. A. Sloane
2022-02-01T01:32:33
oeisdata/seq/A001/A001347.seq
e4105bf3ef3d829891ff49fc385b1477
A001348
Mersenne numbers: 2^p - 1, where p is prime.
[ "3", "7", "31", "127", "2047", "8191", "131071", "524287", "8388607", "536870911", "2147483647", "137438953471", "2199023255551", "8796093022207", "140737488355327", "9007199254740991", "576460752303423487", "2305843009213693951", "147573952589676412927", "2361183241434822606847" ]
[ "nonn", "nice", "easy" ]
161
0
5
[ "A000040", "A000043", "A000225", "A000668", "A001348", "A002145", "A045326", "A046051", "A057951", "A057958", "A100105", "A184085", "A262153" ]
[ "M2694", "N1079" ]
N. J. A. Sloane
2025-04-08T23:29:14
oeisdata/seq/A001/A001348.seq
a0d78e198bdef6951561e190763b92ef
A001349
Number of simple connected graphs on n unlabeled nodes.
[ "1", "1", "1", "2", "6", "21", "112", "853", "11117", "261080", "11716571", "1006700565", "164059830476", "50335907869219", "29003487462848061", "31397381142761241960", "63969560113225176176277", "245871831682084026519528568", "1787331725248899088890200576580", "24636021429399867655322650759681644" ]
[ "nonn", "core", "nice" ]
198
0
5
[ "A000088", "A000719", "A001349", "A002218", "A006290", "A054924", "A201922" ]
[ "M1657", "N0649" ]
N. J. A. Sloane
2025-02-16T08:32:23
oeisdata/seq/A001/A001349.seq
f45a49ffee277baf7cf74bd9bab6f490
A001350
Associated Mersenne numbers.
[ "0", "1", "1", "4", "5", "11", "16", "29", "45", "76", "121", "199", "320", "521", "841", "1364", "2205", "3571", "5776", "9349", "15125", "24476", "39601", "64079", "103680", "167761", "271441", "439204", "710645", "1149851", "1860496", "3010349", "4870845", "7881196", "12752041", "20633239", "33385280", "54018521", "87403801", "141422324" ]
[ "nonn", "easy" ]
228
0
5
[ "A000032", "A001350", "A004146", "A031367", "A098554", "A129744" ]
[ "M3250", "N1311" ]
N. J. A. Sloane, R. K. Guy
2025-01-05T19:51:31
oeisdata/seq/A001/A001350.seq
aa570ead02f28bdb9b7ac84190e508b9
A001351
Associated Mersenne numbers.
[ "0", "1", "3", "1", "3", "11", "9", "8", "27", "37", "33", "67", "117", "131", "192", "341", "459", "613", "999", "1483", "2013", "3032", "4623", "6533", "9477", "14311", "20829", "30007", "44544", "65657", "95139", "139625", "206091", "300763", "439521", "646888", "948051", "1385429", "2033193", "2983787", "4366197", "6397723", "9387072" ]
[ "nonn", "easy", "changed" ]
64
0
5
[ "A001350", "A001351", "A001945" ]
[ "M2217", "N0879" ]
N. J. A. Sloane, R. K. Guy
2025-04-15T13:00:48
oeisdata/seq/A001/A001351.seq
bcb565f485f67657ee29e85d2f612e22
A001352
a(0) = 1, a(1) = 6, a(2) = 24; for n>=3, a(n) = 4a(n-1) - a(n-2).
[ "1", "6", "24", "90", "336", "1254", "4680", "17466", "65184", "243270", "907896", "3388314", "12645360", "47193126", "176127144", "657315450", "2453134656", "9155223174", "34167758040", "127515808986", "475895477904", "1776066102630", "6628368932616", "24737409627834", "92321269578720", "344547668687046" ]
[ "nonn", "easy" ]
58
0
5
[ "A001352", "A001834", "A082841" ]
[ "M4164", "N1731" ]
N. J. A. Sloane
2022-04-13T13:25:15
oeisdata/seq/A001/A001352.seq
721cd47016218891fba937d74541efde
A001353
a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1.
[ "0", "1", "4", "15", "56", "209", "780", "2911", "10864", "40545", "151316", "564719", "2107560", "7865521", "29354524", "109552575", "408855776", "1525870529", "5694626340", "21252634831", "79315912984", "296011017105", "1104728155436", "4122901604639", "15386878263120", "57424611447841", "214311567528244" ]
[ "nonn", "easy", "nice", "changed" ]
427
0
5
[ "A000027", "A001075", "A001090", "A001109", "A001353", "A001542", "A001571", "A001834", "A001835", "A002530", "A002531", "A003500", "A004189", "A004191", "A005246", "A007655", "A016064", "A019679", "A029547", "A029548", "A049660", "A075843", "A077412", "A077421", "A077423", "A078987", "A079935", "A082840", "A097309", "A097311", "A097313", "A097316", "A116469", "A125077", "A144128", "A323182" ]
[ "M3499", "N1420" ]
N. J. A. Sloane
2025-04-18T13:11:50
oeisdata/seq/A001/A001353.seq
7f1af8e0d4e5d6f53d1be135be11625f
A001354
Coordination sequence for hyperbolic tessellation 3^7 (from triangle group (2,3,7)).
[ "1", "7", "21", "56", "147", "385", "1008", "2639", "6909", "18088", "47355", "123977", "324576", "849751", "2224677", "5824280", "15248163", "39920209", "104512464", "273617183", "716339085", "1875400072", "4909861131", "12854183321" ]
[ "nonn", "easy" ]
79
0
5
[ "A000045", "A001354", "A001906" ]
null
N. J. A. Sloane
2022-09-08T08:44:29
oeisdata/seq/A001/A001354.seq
b2371fe4f8f5d25c6a9380dcf35dca3b
A001355
Mix digits of Pi and e.
[ "3", "2", "1", "7", "4", "1", "1", "8", "5", "2", "9", "8", "2", "1", "6", "8", "5", "2", "3", "8", "5", "4", "8", "5", "9", "9", "7", "0", "9", "4", "3", "5", "2", "2", "3", "3", "8", "5", "4", "3", "6", "6", "2", "0", "6", "2", "4", "8", "3", "7", "3", "4", "8", "7", "3", "1", "2", "3", "7", "5", "9", "2", "5", "6", "0", "6", "2", "2", "8", "4", "8", "9", "4", "7", "1", "7", "9", "5", "7", "7", "1", "2", "6", "4", "9", "7", "3", "0", "9", "9", "9", "3", "3", "6", "7", "9", "5", "9", "1", "9" ]
[ "nonn", "base", "cons", "dumb", "easy" ]
29
0
5
[ "A001355", "A058382" ]
[ "M2239", "N0889" ]
N. J. A. Sloane
2024-08-22T20:44:44
oeisdata/seq/A001/A001355.seq
b9a640164bf0124db32a372c61bcad3e
A001356
Dates at fortnightly intervals from Jan 01 in the Julian calendar.
[ "1", "15", "29", "12", "26", "12", "26", "9", "23", "7", "21", "4", "18", "2", "16", "30", "13", "27", "10", "24", "8", "22", "5", "19", "3", "17", "31", "14", "28", "11", "25", "11", "25", "8", "22", "6", "20", "3", "17", "1", "15", "29", "12", "26", "9", "23", "7", "21", "4", "18", "2", "16", "30", "13", "27", "10", "24", "10", "24", "7", "21", "5", "19", "2", "16", "30", "14", "28", "11", "25", "8", "22", "6", "20", "3", "17", "1", "15" ]
[ "nonn", "easy", "nice" ]
38
0
5
[ "A001356", "A051121" ]
[ "M4961", "N2127" ]
N. J. A. Sloane
2023-08-07T01:09:01
oeisdata/seq/A001/A001356.seq
c9767c1906e61f38602f898dee58560f
A001357
Powers of 2 written in base 9.
[ "1", "2", "4", "8", "17", "35", "71", "152", "314", "628", "1357", "2725", "5551", "12212", "24424", "48848", "108807", "218715", "438531", "878162", "1867334", "3845668", "7802447", "16705005", "34511011", "70122022", "150244044", "310488088", "621087187", "1342185385", "2684381781", "5478773672", "12068657454", "24148426018" ]
[ "easy", "base", "nonn" ]
37
0
5
null
[ "M1138", "N0434" ]
N. J. A. Sloane
2022-02-01T01:32:53
oeisdata/seq/A001/A001357.seq
9ffff98e9bd441f1f30dba4733021b4e
A001358
Semiprimes (or biprimes): products of two primes.
[ "4", "6", "9", "10", "14", "15", "21", "22", "25", "26", "33", "34", "35", "38", "39", "46", "49", "51", "55", "57", "58", "62", "65", "69", "74", "77", "82", "85", "86", "87", "91", "93", "94", "95", "106", "111", "115", "118", "119", "121", "122", "123", "129", "133", "134", "141", "142", "143", "145", "146", "155", "158", "159", "161", "166", "169", "177", "178", "183", "185", "187" ]
[ "nonn", "easy", "nice", "core" ]
284
0
5
[ "A000040", "A001222", "A001358", "A002024", "A004526", "A006881", "A014342", "A014612", "A014613", "A014614", "A014673", "A024697", "A037143", "A046306", "A046308", "A046310", "A046312", "A046314", "A046315", "A046388", "A048623", "A048639", "A061299", "A062198", "A064911", "A065516", "A068318", "A069272", "A069273", "A069274", "A069275", "A069276", "A069277", "A069278", "A069279", "A069280", "A069281", "A072000", "A072931", "A072966", "A077554", "A077555", "A084126", "A084127", "A087112", "A087718", "A087794", "A088183", "A089994", "A089995", "A096916", "A096932", "A098350", "A100484", "A100592", "A106550", "A106554", "A108541", "A108542", "A112141", "A115392", "A126663", "A131284", "A138510", "A138511", "A171963", "A176504", "A176506", "A237040", "A289182", "A300912", "A318990", "A320655", "A320732", "A332765", "A338898", "A338904", "A338906", "A338907", "A338910", "A338911", "A338912", "A338913", "A339003", "A339004", "A339114", "A339115", "A339116" ]
[ "M3274", "N1323" ]
N. J. A. Sloane, R. K. Guy
2025-02-16T08:32:23
oeisdata/seq/A001/A001358.seq
a84dbdf90278537622535ca033e021dd
A001359
Lesser of twin primes.
[ "3", "5", "11", "17", "29", "41", "59", "71", "101", "107", "137", "149", "179", "191", "197", "227", "239", "269", "281", "311", "347", "419", "431", "461", "521", "569", "599", "617", "641", "659", "809", "821", "827", "857", "881", "1019", "1031", "1049", "1061", "1091", "1151", "1229", "1277", "1289", "1301", "1319", "1427", "1451", "1481", "1487", "1607" ]
[ "nonn", "nice", "easy", "changed" ]
358
0
5
[ "A000040", "A001097", "A001359", "A002822", "A003627", "A006512", "A007508", "A010051", "A014574", "A040040", "A054735", "A067829", "A071538", "A074822", "A077800", "A082496", "A088328", "A104272", "A117078", "A117563", "A146214", "A178127", "A178128", "A350246", "A350247" ]
[ "M2476", "N0982" ]
N. J. A. Sloane
2025-04-21T16:03:14
oeisdata/seq/A001/A001359.seq
8fa236002c63e03654908c54bdf18945
A001360
Crystal ball sequence for hyperbolic tessellation 3^7 (from triangle group (2,3,7)).
[ "1", "8", "29", "85", "232", "617", "1625", "4264", "11173", "29261", "76616", "200593", "525169", "1374920", "3599597", "9423877", "24672040", "64592249", "169104713", "442721896", "1159060981", "3034461053", "7944322184", "20798505505", "54451194337", "142555077512", "373214038205", "977087037109", "2558047073128", "6697054182281", "17533115473721", "45902292238888" ]
[ "nonn", "easy", "nice" ]
33
0
5
[ "A001354", "A001360" ]
null
N. J. A. Sloane.
2021-03-02T16:31:29
oeisdata/seq/A001/A001360.seq
4b815ef9d262c7a2cabc3ef363f1a748
A001361
Number of points in interior of n-th crystal ball in E_8 lattice.
[ "1", "241", "26641", "338401", "2240161", "10242001", "36638641", "109907521", "288653761", "683158321", "1486914001", "3020862241", "5793372001", "10579330321", "18522042481", "31261968001", "51096647041", "81176500081", "125741512081", "190404140641", "282484116001", "411401129041", "589131731761" ]
[ "nonn", "easy" ]
30
0
5
[ "A001361", "A008340", "A008349" ]
null
N. J. A. Sloane
2022-02-03T02:30:19
oeisdata/seq/A001/A001361.seq
289b6ecd840ff560254627fa4d8a399e
A001362
Number of ways of making change for n cents using coins of 1, 2, 4, 10 cents.
[ "1", "1", "2", "2", "4", "4", "6", "6", "9", "9", "13", "13", "18", "18", "24", "24", "31", "31", "39", "39", "49", "49", "60", "60", "73", "73", "87", "87", "103", "103", "121", "121", "141", "141", "163", "163", "187", "187", "213", "213", "242", "242", "273", "273", "307", "307", "343", "343", "382", "382", "424", "424", "469", "469", "517", "517", "568", "568", "622", "622" ]
[ "nonn" ]
35
0
5
[ "A001304", "A001362" ]
null
N. J. A. Sloane
2022-02-01T01:33:13
oeisdata/seq/A001/A001362.seq
d9f4f35389ebbfcffd48b2e94e025108
A001363
Primes in ternary.
[ "2", "10", "12", "21", "102", "111", "122", "201", "212", "1002", "1011", "1101", "1112", "1121", "1202", "1222", "2012", "2021", "2111", "2122", "2201", "2221", "10002", "10022", "10121", "10202", "10211", "10222", "11001", "11012", "11201", "11212", "12002", "12011", "12112", "12121", "12211", "20001", "20012", "20102", "20122", "20201" ]
[ "base", "nonn", "easy" ]
33
0
5
[ "A000040", "A001363", "A004676", "A004678", "A004679", "A004680", "A004681", "A004682", "A004683", "A004684", "A007089", "A072805" ]
[ "M1961", "N0776" ]
N. J. A. Sloane
2022-02-01T01:33:28
oeisdata/seq/A001/A001363.seq
b8bf7ee5fa086d6f58701e5730a26035
A001364
Number of ways of making change for n cents using coins of 1, 2, 4, 12, 24, 48, 96, 120 cents (based on English coinage of 1939).
[ "1", "1", "2", "2", "4", "4", "6", "6", "9", "9", "12", "12", "17", "17", "22", "22", "29", "29", "36", "36", "45", "45", "54", "54", "67", "67", "80", "80", "97", "97", "114", "114", "135", "135", "156", "156", "183", "183", "210", "210", "243", "243", "276", "276", "315", "315", "354", "354", "403", "403", "452", "452", "511", "511", "570", "570", "639", "639", "708", "708" ]
[ "nonn" ]
28
0
5
null
null
N. J. A. Sloane
2022-02-01T01:33:43
oeisdata/seq/A001/A001364.seq
b7d15f1e9247f1281d0dbd4c2a6231a8
A001365
Expansion of 1/(1-x)^2/(1-x^2)/(1-x^6)/(1-x^12)/(1-x^24)/(1-x^48)/(1-x^60).
[ "1", "2", "4", "6", "9", "12", "17", "22", "29", "36", "45", "54", "67", "80", "97", "114", "135", "156", "183", "210", "243", "276", "315", "354", "403", "452", "511", "570", "639", "708", "791", "874", "971", "1068", "1179", "1290", "1421", "1552", "1703", "1854", "2025", "2196", "2393", "2590" ]
[ "nonn", "easy" ]
29
0
5
null
null
N. J. A. Sloane
2022-02-01T01:33:57
oeisdata/seq/A001/A001365.seq
72f0359afd961132b9334150b0b1eb27
A001366
Maximal number of unattacked squares with n queens on n X n board (answers for n >= 17 only probable).
[ "0", "0", "0", "1", "3", "5", "7", "11", "18", "22", "30", "36", "47", "56", "72", "82", "97", "111", "132", "145", "170", "186", "216", "240", "260", "290", "324", "360", "381", "420" ]
[ "nonn", "more" ]
35
0
5
[ "A001366", "A019317", "A274947" ]
null
Mario Velucchi (mathchess(AT)velucchi.it)
2025-02-16T08:32:23
oeisdata/seq/A001/A001366.seq
d56f8ff0f7e4d4e0b19627c70d14344c
A001367
Solution to f(2) = 1, f(n) = sqrt(n) f(sqrt(n)) + n at values n = 2^2^i.
[ "1", "6", "40", "896", "294912", "23622320128", "119903836479112085504", "2552117751907038475975309555738261585920", "984232758517187661100353372573847216752794869657944794335389464067261601939456" ]
[ "nonn" ]
17
0
5
null
null
Alexander Sorg (sorg(AT)bu.edu)
2024-09-27T09:27:09
oeisdata/seq/A001/A001367.seq
6f315be0945b2ca3cef2eaefbc620e04
A001368
Number of letters in n (in Irish Gaelic).
[ "4", "3", "2", "3", "7", "4", "2", "5", "3", "4", "4", "7", "6", "7", "11", "8", "6", "9", "7", "8", "4", "7", "6", "7", "11", "8", "6", "9", "7", "8", "6", "9", "8", "9", "13", "10", "8", "11", "9", "10", "8", "11", "10", "11", "15", "12", "10", "13", "11", "12", "5", "8", "7", "8", "12", "9", "7", "10", "8", "9", "6", "9", "8", "9", "13", "10", "8", "11", "9", "10", "6", "9", "8", "9", "13" ]
[ "word", "nonn" ]
35
0
5
null
null
Donal LYONS
2019-09-03T20:20:36
oeisdata/seq/A001/A001368.seq
c908ae76672081564b9dcd15449423cc
A001369
Blocks of increasing length using 1,2,3,...,9,10; omit leading 0's.
[ "1", "23", "456", "7891", "1234", "567891", "123456", "78910123", "456789101", "2345678910", "12345678910", "123456789101", "2345678910123", "45678910123456", "789101234567891", "123456789101234", "56789101234567891", "12345678910123456", "7891012345678910123", "45678910123456789101" ]
[ "nonn", "base" ]
24
0
5
[ "A001369", "A007923", "A066547" ]
null
N. J. A. Sloane
2022-02-01T01:34:12
oeisdata/seq/A001/A001369.seq
bd61fd89da5c0d574650333e2f81c992
A001370
Sum of digits of 2^n.
[ "1", "2", "4", "8", "7", "5", "10", "11", "13", "8", "7", "14", "19", "20", "22", "26", "25", "14", "19", "29", "31", "26", "25", "41", "37", "29", "40", "35", "43", "41", "37", "47", "58", "62", "61", "59", "64", "56", "67", "71", "61", "50", "46", "56", "58", "62", "70", "68", "73", "65", "76", "80", "79", "77", "82", "92", "85", "80", "70", "77" ]
[ "base", "easy", "nonn" ]
91
0
5
[ "A000079", "A001370", "A004166", "A007953", "A011754", "A065713", "A065999", "A066001", "A066002", "A066003", "A066004", "A066005", "A066006", "A137284", "A261009" ]
[ "M1085", "N0414" ]
N. J. A. Sloane, Simon Plouffe
2022-12-27T08:33:34
oeisdata/seq/A001/A001370.seq
f3729b436bfc145fb5da49c7069bb509
A001371
Number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is allowed.
[ "1", "2", "1", "2", "3", "6", "8", "16", "24", "42", "69", "124", "208", "378", "668", "1214", "2220", "4110", "7630", "14308", "26931", "50944", "96782", "184408", "352450", "675180", "1296477", "2493680", "4805388", "9272778", "17919558", "34669600", "67156800", "130215996", "252741255", "490984464", "954629662", "1857545298" ]
[ "nonn", "easy", "nice" ]
65
0
5
[ "A001371", "A276550" ]
[ "M0115", "N0045", "N0285" ]
N. J. A. Sloane
2023-02-03T16:31:59
oeisdata/seq/A001/A001371.seq
6615202dac0f2ea658a1de3c5f879993
A001372
Number of unlabeled mappings (or mapping patterns) from n points to themselves; number of unlabeled endofunctions.
[ "1", "1", "3", "7", "19", "47", "130", "343", "951", "2615", "7318", "20491", "57903", "163898", "466199", "1328993", "3799624", "10884049", "31241170", "89814958", "258604642", "745568756", "2152118306", "6218869389", "17988233052", "52078309200", "150899223268", "437571896993", "1269755237948", "3687025544605", "10712682919341", "31143566495273", "90587953109272", "263627037547365" ]
[ "nonn", "nice", "easy" ]
114
0
5
[ "A000312", "A001372", "A001373", "A002861", "A006961", "A054050", "A054745" ]
[ "M2671", "N1069" ]
N. J. A. Sloane
2024-06-30T16:39:44
oeisdata/seq/A001/A001372.seq
08475c6d9f34976ab262e4ec06443de1
A001373
Number of functional digraphs (digraphs of functions on n nodes where every node has outdegree 1 and loops of length 1 are forbidden).
[ "1", "0", "1", "2", "6", "13", "40", "100", "291", "797", "2273", "6389", "18264", "51916", "148666", "425529", "1221900", "3511507", "10111043", "29142941", "84112009", "243000149", "702758065", "2034150215", "5892907566", "17084615940", "49567063847", "143902155133", "418032946298", "1215076634226", "3533715961160", "10282042126394", "29931877173282", "87173224346464", "253989569994664" ]
[ "nonn", "nice", "easy" ]
60
0
5
[ "A000081", "A001372", "A001373", "A002862", "A329228" ]
[ "M1597", "N0623" ]
N. J. A. Sloane
2022-06-17T14:46:00
oeisdata/seq/A001/A001373.seq
1afd1cb8b5c47762f3c0927f994d8310
A001374
Number of relational systems on n nodes. Also number of directed 3-multigraphs with loops on n nodes.
[ "4", "136", "44224", "179228736", "9383939974144", "6558936236286040064", "62879572771326489528942592", "8439543710699844562674685252214784", "16110027001555070629022725866559372785352704", "442829046878106126159584032189649757399796014050181120" ]
[ "nonn", "nice", "easy" ]
37
0
5
[ "A000595", "A001374", "A004105", "A053468", "A053516" ]
[ "M3717", "N1519" ]
N. J. A. Sloane
2024-07-10T14:28:18
oeisdata/seq/A001/A001374.seq
969b36701b92160ff3bb3cf02af48526
A001375
Relational systems on n nodes.
[ "8", "2080", "22386176", "11728394650624", "314824619911446167552", "450720219711043642520721817600", "35398008262453198128587489274987385192448", "155682086692129060007763454017522652304844346252853248" ]
[ "nonn" ]
18
0
5
null
[ "M4589", "N1958" ]
N. J. A. Sloane
2016-11-21T10:53:50
oeisdata/seq/A001/A001375.seq
e7ed893510d88442477de302824f836a
A001376
Relational systems on n nodes.
[ "4", "32896", "3002399885885440", "14178431955039103827204744901417762816", "15077094952775546279110805340148653909930339849938544191736262642546769920", "15403720522893415886546745467461576130202428237004582894538688334760691986727408991549968230000116580053960252500580634898464768" ]
[ "nonn" ]
18
0
5
null
[ "M3726", "N1523" ]
N. J. A. Sloane
2016-11-20T23:37:51
oeisdata/seq/A001/A001376.seq
bf495efaa8c4c13c69372d5a57d932bb
A001377
Number of relations with 4 arguments on n nodes.
[ "2", "32896", "402975273205975947935744", "4824670384888174809315457708695329515706856139873561594988392833332671414272" ]
[ "nonn", "nice" ]
37
0
5
[ "A000595", "A000662", "A001377", "A051241" ]
[ "M2189", "N0875" ]
N. J. A. Sloane
2024-07-02T15:12:10
oeisdata/seq/A001/A001377.seq
ad36fadc8404c5ae2a52140265673c2c
A001378
Degrees of irreducible representations of Baby Monster group B.
[ "1", "4371", "96255", "1139374", "9458750", "9550635", "63532485", "347643114", "356054375", "1407126890", "3214743741", "4221380670", "4275362520", "4622913750", "9287037474", "12501781215", "13508418144", "27416186875", "75844139371", "80426400000" ]
[ "nonn", "fini", "full" ]
23
0
5
null
null
N. J. A. Sloane
2024-06-14T22:31:08
oeisdata/seq/A001/A001378.seq
24fda2f833e862564c18833dd7ba0855
A001379
Degrees of irreducible representations of Monster group M.
[ "1", "196883", "21296876", "842609326", "18538750076", "19360062527", "293553734298", "3879214937598", "36173193327999", "125510727015275", "190292345709543", "222879856734249", "1044868466775133", "1109944460516150", "2374124840062976", "8980616927734375", "8980616927734375", "15178147608537368" ]
[ "nonn", "fini", "full", "nice" ]
51
0
5
[ "A001379", "A002267", "A003131", "A051161" ]
null
N. J. A. Sloane
2025-02-16T08:32:23
oeisdata/seq/A001/A001379.seq
cdc8d65728b4c2b570e5a8329c38e15a
A001380
Weight distribution of binary Golay code of length 24.
[ "1", "0", "759", "2576", "759", "0", "1" ]
[ "nonn", "fini", "full" ]
16
0
5
[ "A001380", "A002289", "A034414", "A034415" ]
null
N. J. A. Sloane
2022-02-01T01:34:44
oeisdata/seq/A001/A001380.seq
d000e43c0748e515de02d92cd6a83ca7
A001381
Weight distribution of binary [ 48,24,12 ] quadratic residue code.
[ "1", "0", "0", "17296", "535095", "3995376", "7681680", "3995376", "535095", "17296", "0", "0", "1" ]
[ "nonn", "fini", "full" ]
10
0
5
null
null
N. J. A. Sloane
2022-09-08T08:44:29
oeisdata/seq/A001/A001381.seq
53fbee4f12245e574d08726658960a0a
A001382
Weight distribution of ternary [ 24,12,9 ] quadratic residue code (also of Pless symmetry code).
[ "1", "0", "0", "4048", "61824", "242880", "198352", "24288", "48" ]
[ "nonn", "fini", "full" ]
11
0
5
[ "A001382", "A112641" ]
null
N. J. A. Sloane
2022-09-08T08:44:29
oeisdata/seq/A001/A001382.seq
4f8d563ca68baa0ce38c249924b88048
A001383
Number of n-node rooted trees of height at most 3.
[ "1", "1", "1", "2", "4", "8", "15", "29", "53", "98", "177", "319", "565", "1001", "1749", "3047", "5264", "9054", "15467", "26320", "44532", "75054", "125904", "210413", "350215", "580901", "960035", "1581534", "2596913", "4251486", "6939635", "11296231", "18337815", "29692431", "47956995", "77271074", "124212966" ]
[ "nonn", "easy", "nice" ]
51
0
5
[ "A000041", "A001383", "A001385", "A034823", "A034826" ]
[ "M1107", "N0422" ]
N. J. A. Sloane
2021-12-19T09:57:48
oeisdata/seq/A001/A001383.seq
83a9eff73e23915b3b36d385400c2449
A001384
Number of n-node trees of height at most 4.
[ "1", "1", "1", "2", "4", "9", "19", "42", "89", "191", "402", "847", "1763", "3667", "7564", "15564", "31851", "64987", "132031", "267471", "539949", "1087004", "2181796", "4367927", "8721533", "17372967", "34524291", "68456755", "135446896", "267444085", "527027186", "1036591718", "2035083599" ]
[ "nonn" ]
41
0
5
[ "A001383", "A001384" ]
[ "M1172", "N0449" ]
N. J. A. Sloane
2021-12-19T09:58:04
oeisdata/seq/A001/A001384.seq
b7eb95b5fdd4bfd8fd13291500885158
A001385
Number of n-node trees of height at most 5.
[ "1", "1", "1", "2", "4", "9", "20", "47", "108", "252", "582", "1345", "3086", "7072", "16121", "36667", "83099", "187885", "423610", "953033", "2139158", "4792126", "10714105", "23911794", "53273599", "118497834", "263164833", "583582570", "1292276355", "2857691087", "6311058671", "13919982308", "30664998056", "67473574130" ]
[ "nonn" ]
34
0
5
[ "A001383", "A001385" ]
[ "M1177", "N0453" ]
N. J. A. Sloane
2021-12-19T09:58:17
oeisdata/seq/A001/A001385.seq
69e5940c6e9a27c7c3babc9668b4dbdf
A001386
Coordination sequence for 4-dimensional I-centered tetragonal orthogonal lattice.
[ "1", "12", "56", "164", "368", "700", "1192", "1876", "2784", "3948", "5400", "7172", "9296", "11804", "14728", "18100", "21952", "26316", "31224", "36708", "42800", "49532", "56936", "65044", "73888", "83500", "93912", "105156", "117264", "130268", "144200", "159092", "174976", "191884", "209848", "228900", "249072", "270396", "292904" ]
[ "nonn", "easy" ]
22
0
5
[ "A001386", "A004006" ]
null
N. J. A. Sloane
2023-12-10T15:53:47
oeisdata/seq/A001/A001386.seq
f1e827e5df2fcd56c848898e331fb668
A001387
The binary "look and say" sequence.
[ "1", "11", "101", "111011", "11110101", "100110111011", "111001011011110101", "111100111010110100110111011", "100110011110111010110111001011011110101", "1110010110010011011110111010110111100111010110100110111011" ]
[ "nonn", "base" ]
63
0
5
[ "A001387", "A001391", "A005150", "A049190", "A049194" ]
null
Thomas L. York
2022-10-05T22:58:18
oeisdata/seq/A001/A001387.seq
e05be9eac34feaa4da4851fb67eba501
A001388
Describe the previous term (in base 3)!.
[ "1", "11", "21", "1211", "111221", "1012211", "1110112221", "101102110211", "111021101221101221", "1011012211011222110112211", "1110211011222110211022110212221", "10110122110211022110122110222110121110211" ]
[ "nonn", "base", "easy" ]
27
0
5
[ "A001388", "A005150" ]
null
Thomas L. York
2024-05-21T01:16:26
oeisdata/seq/A001/A001388.seq
e76418f201159a41a29c0697525f2d52
A001389
To get the 6th term, for example, note that 5th term has three (10 in ternary!) 1's, one (1) 0, etc., giving 10 1 1 0 1 2 2 1 1 2.
[ "2", "12", "1112", "10112", "11102112", "10110122112", "1110211011222112", "10110122110211022112", "1110211011222110122110222112", "10110122110211022110112221101022112", "11102110112221101221102221102110221101110222112" ]
[ "nonn", "base" ]
19
0
5
[ "A001388", "A001389" ]
null
N. J. A. Sloane, Thomas L. York
2017-03-25T05:34:49
oeisdata/seq/A001/A001389.seq
2e47e267469e3cf88ee23cb63d36c716
A001390
Smallest multiplicative generator for quadratic residues mod prime(n).
[ "1", "1", "4", "2", "3", "4", "2", "4", "2", "4", "7", "3", "2", "9", "2", "4", "3", "4", "4", "2", "6", "2", "3", "5", "2", "4", "2", "3", "12", "9", "9", "3", "2", "4", "4", "5", "3", "4", "2", "4", "3", "4", "2", "2", "4", "2", "4", "9", "3", "5", "7", "2", "3", "3", "9", "2", "4", "2", "7", "5", "6", "4", "7", "2", "2", "4", "5", "3", "3", "3", "9", "2", "2", "3", "4", "2", "4", "3", "2", "2", "3", "4", "5", "6", "5", "3", "2", "3", "4", "2", "3", "2", "2", "4", "5", "2", "4", "2", "4", "4", "4", "4", "3", "2", "5", "17" ]
[ "nonn" ]
25
0
5
[ "A000040", "A001390" ]
null
N. J. A. Sloane
2021-12-23T23:05:16
oeisdata/seq/A001/A001390.seq
dc950e4e880f0f70534dd2d88e5d949a
A001391
To get the 3rd term, for example, note that 2nd term has three (11 in binary!) 1's and one (1) 0, giving 11 1 1 0.
[ "10", "1110", "11110", "100110", "1110010110", "111100111010110", "100110011110111010110", "1110010110010011011110111010110", "1111001110101100111001011010011011110111010110" ]
[ "nonn", "base" ]
13
0
5
[ "A001387", "A001391" ]
null
N. J. A. Sloane, Thomas L. York
2017-04-04T04:46:20
oeisdata/seq/A001/A001391.seq
67ac656a59f892475a53b83692d6f930
A001392
a(n) = 9*binomial(2n,n-4)/(n+5).
[ "1", "9", "54", "273", "1260", "5508", "23256", "95931", "389367", "1562275", "6216210", "24582285", "96768360", "379629720", "1485507600", "5801732460", "22626756594", "88152205554", "343176898988", "1335293573130", "5193831553416", "20198233818840", "78542105700240", "305417807763705" ]
[ "nonn", "easy" ]
72
0
5
[ "A000108", "A000245", "A000344", "A000588", "A001392", "A001622", "A002057", "A003517", "A003518", "A003519", "A009766", "A026015", "A030237", "A033184", "A047072", "A059365", "A099039", "A106566", "A130020" ]
[ "M4637", "N1981" ]
N. J. A. Sloane
2022-01-02T09:48:48
oeisdata/seq/A001/A001392.seq
b11ee1ca36a8e47642ab5b9e0a1bb281
A001393
High temperature series for spin-1/2 Ising free energy on 3-dimensional simple cubic lattice.
[ "1", "0", "3", "22", "192", "2046", "24853", "329334", "4649601", "68884356", "1059830112", "16809862992", "273374177222", "4539862959852", "76744615270821", "1317316023432372", "22913901542478978", "403242080061821802", "7169757254509112094", "128654570700129670404", "2327634530912450464791", "42424918919225263486322", "778469235834728913157632", "14371906938404203811137770" ]
[ "nonn", "nice" ]
35
0
5
[ "A001393", "A001406", "A001407", "A002891", "A010571" ]
[ "M3093", "N1253" ]
N. J. A. Sloane
2022-02-14T07:33:15
oeisdata/seq/A001/A001393.seq
173208ed2c0ee2892432d66633efdb45
A001394
Number of n-step self-avoiding walks on diamond.
[ "1", "4", "12", "36", "108", "324", "948", "2796", "8196", "24060", "70188", "205284", "597996", "1744548", "5073900", "14774652", "42922452", "124814484", "362267652", "1052271732", "3051900516", "8857050204", "25671988020", "74449697484", "215677847460", "625096195404", "1810062340812", "5243388472212" ]
[ "nonn", "walk", "nice" ]
38
0
5
[ "A001394", "A001395", "A001396", "A001397", "A001398", "A097700", "A176086", "A227715", "A227716" ]
[ "M3452", "N1403" ]
N. J. A. Sloane
2023-09-03T20:59:15
oeisdata/seq/A001/A001394.seq
9478800a7b7b5c83f1087e58c1ae59ba
A001395
Number of (2n+1)-step self-avoiding walks on diamond lattice ending at point with x = 1.
[ "2", "10", "74", "518", "3934", "29914", "232094", "1812890", "14277886", "113016230", "898797262", "7173454238", "57431351010", "460989676450", "3708603354110", "29893215059758" ]
[ "nonn", "walk", "more" ]
30
0
5
[ "A001394", "A001395", "A001396", "A001397", "A001398", "A227715", "A227716" ]
[ "M1973", "N0782" ]
N. J. A. Sloane
2021-12-23T23:04:02
oeisdata/seq/A001/A001395.seq
f8f720721485f4a78c9c1493dbff0b31
A001396
Number of 2n-step self-avoiding walks on diamond lattice ending at point with x = 0.
[ "1", "4", "28", "188", "1428", "10708", "82948", "644788", "5067404", "40016460", "317727164", "2532064332", "20247784124", "162353831796", "1304943724900", "10510168583516" ]
[ "nonn", "walk", "more" ]
27
0
5
[ "A001394", "A001395", "A001396", "A001397", "A001398", "A227715", "A227716" ]
[ "M3623", "N1471" ]
N. J. A. Sloane
2021-12-23T23:03:48
oeisdata/seq/A001/A001396.seq
07c643ee82819c0398c8bba31ad81fde
A001397
Number of 2n-step self-avoiding walks on diamond lattice ending at point with x = 2.
[ "4", "24", "188", "1368", "10572", "81376", "637148", "5007560", "39638728", "314980912", "2513038452", "20109809792", "161359033480", "1297640775272", "10456351280264" ]
[ "nonn", "walk", "more" ]
24
0
5
[ "A001394", "A001395", "A001396", "A001397", "A001398", "A227715", "A227716" ]
[ "M3602", "N1461" ]
N. J. A. Sloane
2021-12-23T23:03:34
oeisdata/seq/A001/A001397.seq
877b240de855f2164deeb64c09945126
A001398
Number of (2n+1)-step self-avoiding walks on diamond lattice ending at point with x = 3.
[ "8", "56", "464", "3520", "27768", "217316", "1719616", "13633972", "108620060", "867750412", "6952901716", "55838915036", "449398552664", "3623393504692", "29262315259524" ]
[ "nonn", "walk", "more" ]
25
0
5
[ "A001394", "A001395", "A001396", "A001397", "A001398", "A227715", "A227716" ]
[ "M4546", "N1930" ]
N. J. A. Sloane
2019-01-12T10:30:33
oeisdata/seq/A001/A001398.seq
bbd820d1aa0d399a87e59c3f4a2d13e2
A001399
a(n) is the number of partitions of n into at most 3 parts; also partitions of n+3 in which the greatest part is 3; also number of unlabeled multigraphs with 3 nodes and n edges.
[ "1", "1", "2", "3", "4", "5", "7", "8", "10", "12", "14", "16", "19", "21", "24", "27", "30", "33", "37", "40", "44", "48", "52", "56", "61", "65", "70", "75", "80", "85", "91", "96", "102", "108", "114", "120", "127", "133", "140", "147", "154", "161", "169", "176", "184", "192", "200", "208", "217", "225", "234", "243", "252", "261", "271", "280", "290", "300", "310", "320", "331", "341" ]
[ "nonn", "easy", "nice", "changed" ]
459
0
5
[ "A000228", "A001399", "A001400", "A001401", "A003082", "A007304", "A008615", "A008619", "A008724", "A014612", "A026810", "A026811", "A026812", "A026813", "A026814", "A026815", "A026816", "A036496", "A037144", "A051037", "A051263", "A069905", "A080193", "A117485", "A143207", "A192517", "A266744", "A266751", "A307534" ]
[ "M0518", "N0186" ]
N. J. A. Sloane
2025-04-20T20:13:34
oeisdata/seq/A001/A001399.seq
8abcb3ab68d73b88d770d619b95a5717
A001400
Number of partitions of n into at most 4 parts.
[ "1", "1", "2", "3", "5", "6", "9", "11", "15", "18", "23", "27", "34", "39", "47", "54", "64", "72", "84", "94", "108", "120", "136", "150", "169", "185", "206", "225", "249", "270", "297", "321", "351", "378", "411", "441", "478", "511", "551", "588", "632", "672", "720", "764", "816", "864", "920", "972", "1033", "1089", "1154", "1215", "1285", "1350", "1425", "1495" ]
[ "nonn", "easy" ]
257
0
5
[ "A001399", "A001400", "A001401", "A002621", "A005044", "A008284", "A008619", "A026810", "A026820", "A070083", "A117486" ]
[ "M0627", "N0229" ]
N. J. A. Sloane
2025-03-30T15:52:25
oeisdata/seq/A001/A001400.seq
09d344da45492c84ab8d537113b1cc2b