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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.

A009272 Expansion of e.g.f. exp(tanh(x)*tan(x)), even powers only.

Table of values

n a(n)
0 1
1 2
2 12
3 232
4 7952
5 405152
6 31111872
7 3115956352
8 414147567872
9 68413355397632
10 13936708915940352
11 3412444856961083392
12 987956358173680013312
13 334650367409781717573632
14 130572314003924554412900352
15 58337032599905770133366013952

List of values

[1, 2, 12, 232, 7952, 405152, 31111872, 3115956352, 414147567872, 68413355397632, 13936708915940352, 3412444856961083392, 987956358173680013312, 334650367409781717573632, 130572314003924554412900352, 58337032599905770133366013952]

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

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