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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.

A295255 Expansion of e.g.f. 2/(1 + sqrt(1 - 4*x*cos(x))).

Table of values

n a(n)
0 1
1 1
2 4
3 27
4 288
5 4145
6 75360
7 1655003
8 42628096
9 1260274689
10 42070233600
11 1565308844539
12 64237925148672
13 2882670856605553
14 140430196702035968
15 7380867094885024635
16 416320345406371921920
17 25084955259883686000257
18 1608058868442709001895936
19 109278344982307590211482971

List of values

[1, 1, 4, 27, 288, 4145, 75360, 1655003, 42628096, 1260274689, 42070233600, 1565308844539, 64237925148672, 2882670856605553, 140430196702035968, 7380867094885024635, 416320345406371921920, 25084955259883686000257, 1608058868442709001895936, 109278344982307590211482971]

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

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