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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.

A296623 Expansion of e.g.f. log(1 + arctan(x)*arctanh(x)) (even powers only).

Table of values

n a(n)
0 0
1 2
2 -12
3 448
4 -21728
5 2380032
6 -318185472
7 69695846400
8 -18235768762368
9 6697099792220160
10 -2892199532135841792
11 1606188416621920911360
12 -1034069421398404544593920
13 810882197441673837894696960
14 -727447103613537543910242385920
15 766865924510666637669136261447680

List of values

[0, 2, -12, 448, -21728, 2380032, -318185472, 69695846400, -18235768762368, 6697099792220160, -2892199532135841792, 1606188416621920911360, -1034069421398404544593920, 810882197441673837894696960, -727447103613537543910242385920, 766865924510666637669136261447680]

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

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