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.

A239777 Number of pairs of functions f, g on a size n set into itself satisfying f(g(g(x))) = f(x).

Table of values

n a(n)
0 1
1 1
2 12
3 249
4 7744
5 326745
6 17773056
7 1197261289
8 97165842432
9 9294416254161
10 1030298497753600
11 130527793649586201
12 18685034341191917568
13 2993332161753700720681
14 532270629438646194561024
15 104316725427708352041239625
16 22394627939996943667912769536

List of values

[1, 1, 12, 249, 7744, 326745, 17773056, 1197261289, 97165842432, 9294416254161, 1030298497753600, 130527793649586201, 18685034341191917568, 2993332161753700720681, 532270629438646194561024, 104316725427708352041239625, 22394627939996943667912769536]

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

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