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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.

A096721 Numerators of terms in series expansion of arcsin(arctan(x)) - arctan(arcsin(x)).

Table of values

n a(n)
0 0
1 0
2 0
3 -1
4 13
5 -2329
6 3749
7 -1405132357
8 41223659
9 -3230487913
10 87420689313263
11 -92876785811395309
12 6545378422138547141
13 -76226954122169434345117
14 13717355610784766550119
15 -152042860419225571514252591
16 325359516347299085987218014617
17 -501994552683503696983628163720749
18 226141284010354023120430917899293

List of values

[0, 0, 0, -1, 13, -2329, 3749, -1405132357, 41223659, -3230487913, 87420689313263, -92876785811395309, 6545378422138547141, -76226954122169434345117, 13717355610784766550119, -152042860419225571514252591, 325359516347299085987218014617, -501994552683503696983628163720749, 226141284010354023120430917899293]

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

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