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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.

A296787 Expansion of e.g.f. exp(x*arctan(x)) (even powers only).

Table of values

n a(n)
0 1
1 2
2 4
3 24
4 -496
5 36000
6 -3753408
7 556961664
8 -111591202560
9 29054584410624
10 -9541382573767680
11 3858875286730168320
12 -1884995591107521540096
13 1094305223336273239449600
14 -744771228363250138965196800
15 587358379156469629707528929280

List of values

[1, 2, 4, 24, -496, 36000, -3753408, 556961664, -111591202560, 29054584410624, -9541382573767680, 3858875286730168320, -1884995591107521540096, 1094305223336273239449600, -744771228363250138965196800, 587358379156469629707528929280]

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

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