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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.

A099617 Denominators of the coefficients in the Taylor expansion of sec(x) + tan(x) around x=0.

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 24
5 15
6 720
7 315
8 8064
9 2835
10 3628800
11 155925
12 95800320
13 6081075
14 87178291200
15 638512875
16 4184557977600
17 10854718875
18 6402373705728000
19 1856156927625
20 97316080327065600
21 194896477400625
22 1124000727777607680000
23 2900518163668125
24 9545360026665222144000

List of values

[1, 1, 2, 3, 24, 15, 720, 315, 8064, 2835, 3628800, 155925, 95800320, 6081075, 87178291200, 638512875, 4184557977600, 10854718875, 6402373705728000, 1856156927625, 97316080327065600, 194896477400625, 1124000727777607680000, 2900518163668125, 9545360026665222144000]

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

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