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.

A239771 Number of pairs of functions (f,g) from a size n set into itself satisfying f(x) = g(g(f(x))).

Table of values

n a(n)
0 1
1 1
2 10
3 213
4 8056
5 465945
6 37823616
7 4075467781
8 560230714240
9 95369455852497
10 19643693349548800
11 4805295720474420501
12 1374890520609054683136
13 454286686896040037996905
14 171479277693049020232695808
15 73262491601904459123264721125
16 35143072854722729593790081499136

List of values

[1, 1, 10, 213, 8056, 465945, 37823616, 4075467781, 560230714240, 95369455852497, 19643693349548800, 4805295720474420501, 1374890520609054683136, 454286686896040037996905, 171479277693049020232695808, 73262491601904459123264721125, 35143072854722729593790081499136]

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

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