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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A175707 Number of ways to put n copies of 1,2,3,4 into sets.

Table of values

n a(n)
0 1
1 15
2 139
3 862
4 4079
5 15791
6 52450
7 154279
8 411180
9 1009741
10 2314278
11 5000125
12 10264997
13 20152950
14 38037517
15 69323949
16 122448455
17 210271756
18 351989816
19 575711716
20 921889652
21 1447822620
22 2233501928
23 3389114724
24 5064582169
25 7461570579
26 10848490675
27 15579077786
28 22115241763
29 31054971635
30 43166197978
31 59427633555
32 81077755892
33 109673237289
34 147158299390
35 195946638641

List of values

[1, 15, 139, 862, 4079, 15791, 52450, 154279, 411180, 1009741, 2314278, 5000125, 10264997, 20152950, 38037517, 69323949, 122448455, 210271756, 351989816, 575711716, 921889652, 1447822620, 2233501928, 3389114724, 5064582169, 7461570579, 10848490675, 15579077786, 22115241763, 31054971635, 43166197978, 59427633555, 81077755892, 109673237289, 147158299390, 195946638641]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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