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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.

A292756 Expansion of e.g.f. exp(x)*(tan(x)+sec(x))^2.

Table of values

n a(n)
0 1
1 3
2 9
3 29
4 105
5 433
6 2029
7 10709
8 63025
9 409713
10 2917749
11 22599389
12 189200745
13 1702839193
14 16397919469
15 168248900069
16 1832540103265
17 21118133619873
18 256725609081189
19 3283461599832749
20 44074814323890585
21 619564244562907753
22 9102144892897546909
23 139495284063955397429

List of values

[1, 3, 9, 29, 105, 433, 2029, 10709, 63025, 409713, 2917749, 22599389, 189200745, 1702839193, 16397919469, 168248900069, 1832540103265, 21118133619873, 256725609081189, 3283461599832749, 44074814323890585, 619564244562907753, 9102144892897546909, 139495284063955397429]

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

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