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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.

A307594 Expansion of e.g.f. (sec(x) + tan(x))*exp(-x)/(1 - x).

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 28
5 145
6 880
7 6221
8 50048
9 452097
10 4531440
11 49919461
12 599595192
13 7799387921
14 109232872424
15 1638888843541
16 26226252579296
17 445889920626817
18 8026518496420896
19 152509898418037765
20 3050274960962524520
21 64056803495548131665
22 1409264093116606297080

List of values

[1, 1, 2, 7, 28, 145, 880, 6221, 50048, 452097, 4531440, 49919461, 599595192, 7799387921, 109232872424, 1638888843541, 26226252579296, 445889920626817, 8026518496420896, 152509898418037765, 3050274960962524520, 64056803495548131665, 1409264093116606297080]

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

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