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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.

A009817 Expansion of e.g.f. tanh(tan(x)*x) (even powers only).

Table of values

n a(n)
0 0
1 2
2 8
3 -144
4 -11264
5 -323840
6 36347904
7 8388294656
8 620426657792
9 -168731721990144
10 -79627879039631360
11 -11099857853570613248
12 5627175549005859913728
13 4469405304978356270268416

List of values

[0, 2, 8, -144, -11264, -323840, 36347904, 8388294656, 620426657792, -168731721990144, -79627879039631360, -11099857853570613248, 5627175549005859913728, 4469405304978356270268416]

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

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