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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.

A330255 Expansion of e.g.f. Sum_{k>=1} (cosh(x^k) - 1) (even powers only).

Table of values

n a(n)
1 1
2 13
3 361
4 21841
5 1814401
6 260124481
7 43589145601
8 11333696774401
9 3210079038566401
10 1317822591538252801
11 562000363888803840001
12 336953340897297630105601
13 201645730563302817792000001
14 165147853334842304408401920001
15 132994909752412012763531673600001

List of values

[1, 13, 361, 21841, 1814401, 260124481, 43589145601, 11333696774401, 3210079038566401, 1317822591538252801, 562000363888803840001, 336953340897297630105601, 201645730563302817792000001, 165147853334842304408401920001, 132994909752412012763531673600001]

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

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