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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.

A009723 Expansion of tan(tanh(x)/cos(x)).

Table of values

n a(n)
0 1
1 3
2 57
3 1995
4 128881
5 12775059
6 1796958633
7 342118793307
8 84276974508769
9 26141579246291235
10 9956883572644073241
11 4570240365824839488747
12 2487549038143714062879313
13 1584207614996350912703688627

List of values

[1, 3, 57, 1995, 128881, 12775059, 1796958633, 342118793307, 84276974508769, 26141579246291235, 9956883572644073241, 4570240365824839488747, 2487549038143714062879313, 1584207614996350912703688627]

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

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