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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.

A296838 Expansion of e.g.f. log(1 + x*tanh(x/2)) (even powers only).

Table of values

n a(n)
0 0
1 1
2 -4
3 48
4 -1186
5 50060
6 -3226206
7 294835184
8 -36270477034
9 5779302944436
10 -1157856177719830
11 284876691727454552
12 -84442374415240892898
13 29680054107768128647388
14 -12205478262363331593956686
15 5805823539844285054558025280
16 -3163004294186696659107788567386

List of values

[0, 1, -4, 48, -1186, 50060, -3226206, 294835184, -36270477034, 5779302944436, -1157856177719830, 284876691727454552, -84442374415240892898, 29680054107768128647388, -12205478262363331593956686, 5805823539844285054558025280, -3163004294186696659107788567386]

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

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