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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.

A346292 a(0) = 1; a(n) = (1/n) * Sum_{k=3..n} (binomial(n,k) * k!)^2 * a(n-k) / k.

Table of values

n a(n)
0 1
1 0
2 0
3 4
4 36
5 576
6 17600
7 694800
8 35802144
9 2391438336
10 200018045952
11 20476348214400
12 2521840589347200
13 368057828019898368
14 62841061478699292672
15 12413136137144581203456
16 2809529229255558769612800
17 722458985698006017844838400
18 209487621780682072569567903744

List of values

[1, 0, 0, 4, 36, 576, 17600, 694800, 35802144, 2391438336, 200018045952, 20476348214400, 2521840589347200, 368057828019898368, 62841061478699292672, 12413136137144581203456, 2809529229255558769612800, 722458985698006017844838400, 209487621780682072569567903744]

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

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