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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.

A009563 Expansion of e.g.f. sin(x/cosh(x)) (odd powers only).

Table of values

n a(n)
0 1
1 -4
2 56
3 -1688
4 84160
5 -6141312
6 613282944
7 -80158806016
8 13267800137728
9 -2710082835353600
10 669033814167273472
11 -196220826200422416384
12 67398310755666413387776
13 -26784943833122921085534208
14 12188704989839014070713057280
15 -6294241591527906725538628370432

List of values

[1, -4, 56, -1688, 84160, -6141312, 613282944, -80158806016, 13267800137728, -2710082835353600, 669033814167273472, -196220826200422416384, 67398310755666413387776, -26784943833122921085534208, 12188704989839014070713057280, -6294241591527906725538628370432]

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

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