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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.

A317666 G.f. A(x) satisfies: Sum_{n>=0} ( 1/A(x) - (1-x)^(2*n) )^n = 1.

Table of values

n a(n)
0 1
1 2
2 7
3 48
4 590
5 10602
6 244457
7 6767792
8 216875258
9 7863473864
10 317632851912
11 14132208327052
12 686514289288897
13 36154193924315170
14 2051928741855927465
15 124870207134047889232
16 8112089716821244526285
17 560396754826502247713090
18 41024663835523296400398275
19 3172738829903313189522259140
20 258493327059457440608140711531

List of values

[1, 2, 7, 48, 590, 10602, 244457, 6767792, 216875258, 7863473864, 317632851912, 14132208327052, 686514289288897, 36154193924315170, 2051928741855927465, 124870207134047889232, 8112089716821244526285, 560396754826502247713090, 41024663835523296400398275, 3172738829903313189522259140, 258493327059457440608140711531]

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

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