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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.

A317668 G.f. A(x) satisfies: Sum_{n>=0} ( 1/A(x) - (1-x)^(4*n) )^n = 1.

Table of values

n a(n)
0 1
1 4
2 26
3 356
4 8871
5 320672
6 14811200
7 820185072
8 52546341422
9 3808527303300
10 307523461730866
11 27352330591164308
12 2656394433081980649
13 279696497208771609120
14 31739466678890197201328
15 3862114024795578127697248
16 501700135604304149492422266
17 69305144023051764776753873168
18 10145743117833906529065611237208
19 1569100081969097895595627120200512

List of values

[1, 4, 26, 356, 8871, 320672, 14811200, 820185072, 52546341422, 3808527303300, 307523461730866, 27352330591164308, 2656394433081980649, 279696497208771609120, 31739466678890197201328, 3862114024795578127697248, 501700135604304149492422266, 69305144023051764776753873168, 10145743117833906529065611237208, 1569100081969097895595627120200512]

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

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