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.

A239761 Number of pairs of functions (f, g) on a set of n elements into itself satisfying f(g(x)) = f(x).

Table of values

n a(n)
0 1
1 1
2 10
3 159
4 3496
5 98345
6 3373056
7 136535455
8 6371523712
9 336784920849
10 19888195110400
11 1297716672601151
12 92721494240225280
13 7199830049013964921
14 603715489091812335616
15 54366622743565012989375
16 5233114241479255004839936
17 536180296483497244155041825

List of values

[1, 1, 10, 159, 3496, 98345, 3373056, 136535455, 6371523712, 336784920849, 19888195110400, 1297716672601151, 92721494240225280, 7199830049013964921, 603715489091812335616, 54366622743565012989375, 5233114241479255004839936, 536180296483497244155041825]

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

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