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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.

A009010 Expansion of e.g.f.: 1/cos(tan(x)) (even-indexed coefficients only).

Table of values

n a(n)
0 1
1 1
2 13
3 397
4 22265
5 1996569
6 262056837
7 47378857957
8 11289999097969
9 3429209143916337
10 1293273763150662781
11 592937704157794933821
12 324791587492604492427881
13 209490216975221386279672393
14 157153880464155360205476452597

List of values

[1, 1, 13, 397, 22265, 1996569, 262056837, 47378857957, 11289999097969, 3429209143916337, 1293273763150662781, 592937704157794933821, 324791587492604492427881, 209490216975221386279672393, 157153880464155360205476452597]

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

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