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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.

A003721 Expansion of e.g.f. tan(tanh(x)) (odd powers only).

Table of values

n a(n)
0 1
1 0
2 -8
3 112
4 -128
5 -109824
6 8141824
7 -353878016
8 -9666461696
9 5151942574080
10 -825073851170816
11 76429076694827008
12 2051308253366714368
13 -2361338488910424047616
14 171581865952588387581952

List of values

[1, 0, -8, 112, -128, -109824, 8141824, -353878016, -9666461696, 5151942574080, -825073851170816, 76429076694827008, 2051308253366714368, -2361338488910424047616, 171581865952588387581952]

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

Content is available under The OEIS End-User License Agreement.