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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.

A213068 Expansion of e.g.f. arcsinh(sech(x)^2), even powers only.

Table of values

n a(n)
0 0
1 -1
2 5
3 -31
4 -85
5 4919
6 1248125
7 -158970631
8 2094813635
9 2311829506319
10 -210731879464555
11 -109642894428121231
12 37051431528058442555
13 4409666909576599299719
14 -6492299377660512249146035
15 648925901618982079024132169

List of values

[0, -1, 5, -31, -85, 4919, 1248125, -158970631, 2094813635, 2311829506319, -210731879464555, -109642894428121231, 37051431528058442555, 4409666909576599299719, -6492299377660512249146035, 648925901618982079024132169]

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

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