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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.

A307879 Expansion of e.g.f. exp(4*x)*(sec(x) + tan(x)).

Table of values

n a(n)
0 1
1 5
2 25
3 126
4 645
5 3380
6 18285
7 103036
8 610345
9 3833540
10 25714345
11 185107596
12 1433220045
13 11932724900
14 106613406405
15 1019012112556
16 10382757537745
17 112378069315460
18 1287787864054465
19 15576862520435916
20 198330820236011445
21 2651486893149253220
22 37135749401704458525

List of values

[1, 5, 25, 126, 645, 3380, 18285, 103036, 610345, 3833540, 25714345, 185107596, 1433220045, 11932724900, 106613406405, 1019012112556, 10382757537745, 112378069315460, 1287787864054465, 15576862520435916, 198330820236011445, 2651486893149253220, 37135749401704458525]

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

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