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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.

A370669 Expansion of Sum_{k>=0} k! * ( x/(1+x^2) )^k.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 20
5 103
6 630
7 4475
8 36232
9 329341
10 3320890
11 36787889
12 444125628
13 5803850515
14 81625106990
15 1229298774647
16 19738870726160
17 336627732586105
18 6076590994501938
19 115752541255203869
20 2320456607696181220
21 48833227436258924671
22 1076420625931284514342

List of values

[1, 1, 2, 5, 20, 103, 630, 4475, 36232, 329341, 3320890, 36787889, 444125628, 5803850515, 81625106990, 1229298774647, 19738870726160, 336627732586105, 6076590994501938, 115752541255203869, 2320456607696181220, 48833227436258924671, 1076420625931284514342]

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

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