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.

A239838 Number of ordered pairs of permutation functions on n elements where f(f(f(x))) = g(g(g(x))).

Table of values

n a(n)
0 1
1 1
2 2
3 12
4 96
5 600
6 9360
7 146160
8 1935360
9 41368320
10 1092268800
11 23111827200
12 700300339200
13 26141033318400
14 810322216704000
15 31624796915712000
16 1537594906079232000
17 63980698878480384000
18 3128302230597992448000
19 187447679378885173248000

List of values

[1, 1, 2, 12, 96, 600, 9360, 146160, 1935360, 41368320, 1092268800, 23111827200, 700300339200, 26141033318400, 810322216704000, 31624796915712000, 1537594906079232000, 63980698878480384000, 3128302230597992448000, 187447679378885173248000]

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

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