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.

A239752 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(x)) = g(f(f(x))).

Table of values

n a(n)
0 1
1 1
2 6
3 123
4 4792
5 294645
6 26351856
7 3213829339
8 511432765824
9 102813166760265
10 25450790212460800
11 7599894406225438911
12 2691706949197641133056
13 1114869818722491048119773
14 533573397145124307890731008
15 292063395009538745067415219875
16 181221082305680372426427865071616

List of values

[1, 1, 6, 123, 4792, 294645, 26351856, 3213829339, 511432765824, 102813166760265, 25450790212460800, 7599894406225438911, 2691706949197641133056, 1114869818722491048119773, 533573397145124307890731008, 292063395009538745067415219875, 181221082305680372426427865071616]

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

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