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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.

A196559 G.f.: exp( Sum_{n>=1} [Sum_{k=0..n} C(n,k)^3 * x^k]^2 * x^n/n ).

Table of values

n a(n)
0 1
1 1
2 3
3 12
4 65
5 384
6 2197
7 14078
8 94739
9 670612
10 4899280
11 36645899
12 281037158
13 2197679518
14 17489660228
15 141241307806
16 1155345218645
17 9559672712389
18 79905432682918
19 674005489358155
20 5731854529045978
21 49105864505432392
22 423531623342726441

List of values

[1, 1, 3, 12, 65, 384, 2197, 14078, 94739, 670612, 4899280, 36645899, 281037158, 2197679518, 17489660228, 141241307806, 1155345218645, 9559672712389, 79905432682918, 674005489358155, 5731854529045978, 49105864505432392, 423531623342726441]

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

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