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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.

A009234 Expansion of e.g.f.: exp(sinh(x)/cos(x)).

Table of values

n a(n)
0 1
1 1
2 1
3 5
4 17
5 77
6 457
7 2641
8 19777
9 149529
10 1305489
11 12183613
12 122670033
13 1342074021
14 15462740633
15 192192501897
16 2502900454401
17 34713417890609
18 504155298072609
19 7713202738776565
20 123438576028985873

List of values

[1, 1, 1, 5, 17, 77, 457, 2641, 19777, 149529, 1305489, 12183613, 122670033, 1342074021, 15462740633, 192192501897, 2502900454401, 34713417890609, 504155298072609, 7713202738776565, 123438576028985873]

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

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