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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.

A228907 G.f. satisfies: A(x) = 1 + Sum_{n>=0} x^n * (1 - A(x)^(2*n))/(1 - A(x)).

Table of values

n a(n)
0 1
1 2
2 6
3 24
4 114
5 598
6 3336
7 19402
8 116302
9 713368
10 4455650
11 28240942
12 181180912
13 1174280146
14 7677229718
15 50570040088
16 335289825874
17 2235856077798
18 14985808827416
19 100900119437082
20 682145490613118
21 4628755102582328
22 31514118237222850
23 215214456560655070

List of values

[1, 2, 6, 24, 114, 598, 3336, 19402, 116302, 713368, 4455650, 28240942, 181180912, 1174280146, 7677229718, 50570040088, 335289825874, 2235856077798, 14985808827416, 100900119437082, 682145490613118, 4628755102582328, 31514118237222850, 215214456560655070]

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

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