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.

A239760 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(x) = f(f(g(x))).

Table of values

n a(n)
0 1
1 1
2 10
3 123
4 1984
5 38765
6 899856
7 24135055
8 734381824
9 24985937241
10 939674886400
11 38697245287811
12 1731506682516480
13 83631998873272837
14 4336190248653942784
15 240186479159794548375
16 14153996066789439471616
17 884109266328681103701425
18 58346867827408911965945856

List of values

[1, 1, 10, 123, 1984, 38765, 899856, 24135055, 734381824, 24985937241, 939674886400, 38697245287811, 1731506682516480, 83631998873272837, 4336190248653942784, 240186479159794548375, 14153996066789439471616, 884109266328681103701425, 58346867827408911965945856]

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

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