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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.

A009009 Expansion of e.g.f.: 1/cos(sinh(x)) (even-indexed coefficients only).

Table of values

n a(n)
0 1
1 1
2 9
3 177
4 6545
5 387649
6 33646041
7 4025701617
8 635120351777
9 127753094128897
10 31911422805749673
11 9691219439564235441
12 3516474983468155702193
13 1502487398886128051614273
14 746659439867912626958616441
15 427003792367575880943003380721

List of values

[1, 1, 9, 177, 6545, 387649, 33646041, 4025701617, 635120351777, 127753094128897, 31911422805749673, 9691219439564235441, 3516474983468155702193, 1502487398886128051614273, 746659439867912626958616441, 427003792367575880943003380721]

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

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