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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.

A368837 a(n) = n! * (n+2)! * Sum_{k=0..n} 1/(k! * (k+2)!).

Table of values

n a(n)
0 1
1 4
2 33
3 496
4 11905
5 416676
6 20000449
7 1260028288
8 100802263041
9 9979424041060
10 1197530884927201
11 171246916544589744
12 28769481979491076993
13 5610048986000760013636
14 1256650972864170243054465
15 320445998080363411978888576

List of values

[1, 4, 33, 496, 11905, 416676, 20000449, 1260028288, 100802263041, 9979424041060, 1197530884927201, 171246916544589744, 28769481979491076993, 5610048986000760013636, 1256650972864170243054465, 320445998080363411978888576]

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

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