cp's OEIS Frontend

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.

A346291 a(0) = 1; a(n) = (1/n) * Sum_{k=2..n} (binomial(n,k) * k!)^2 * a(n-k) / k.

Table of values

n a(n)
0 1
1 0
2 1
3 4
4 54
5 976
6 27050
7 1037016
8 53040344
9 3494603904
10 288738690552
11 29267185135200
12 3573720291756912
13 517691602686711168
14 87813773085480166608
15 17246816939881695262656
16 3883816372280829757142400
17 994217196872849143760818176
18 287129874355801742457562921344

List of values

[1, 0, 1, 4, 54, 976, 27050, 1037016, 53040344, 3494603904, 288738690552, 29267185135200, 3573720291756912, 517691602686711168, 87813773085480166608, 17246816939881695262656, 3883816372280829757142400, 994217196872849143760818176, 287129874355801742457562921344]

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

Content is available under The OEIS End-User License Agreement.