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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.

A009398 Expansion of log(1+tanh(x)*tan(x)).

Table of values

n a(n)
0 0
1 2
2 -12
3 352
4 -16352
5 1382912
6 -172372992
7 30716649472
8 -7334631698432
9 2270814362796032
10 -883463096359452672
11 422158497266733678592
12 -243014206258719292915712
13 165880670114405086398513152

List of values

[0, 2, -12, 352, -16352, 1382912, -172372992, 30716649472, -7334631698432, 2270814362796032, -883463096359452672, 422158497266733678592, -243014206258719292915712, 165880670114405086398513152]

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

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