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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.

A024257 Expansion of tanh(tan(x)*x)/2.

Table of values

n a(n)
0 0
1 1
2 4
3 -72
4 -5632
5 -161920
6 18173952
7 4194147328
8 310213328896
9 -84365860995072
10 -39813939519815680
11 -5549928926785306624
12 2813587774502929956864
13 2234702652489178135134208
14 497733049858403607865458688

List of values

[0, 1, 4, -72, -5632, -161920, 18173952, 4194147328, 310213328896, -84365860995072, -39813939519815680, -5549928926785306624, 2813587774502929956864, 2234702652489178135134208, 497733049858403607865458688]

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

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