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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.

A239781 Number of pairs of functions f, g from a size n set into itself satisfying f(g(x)) = f(f(g(x))).

Table of values

n a(n)
0 1
1 1
2 12
3 321
4 15280
5 1127745
6 118507536
7 16731979033
8 3044595017472
9 692050790547297
10 191796657547052800
11 63563842088104098081
12 24793529117087476242432
13 11232023076988690608825505
14 5843573099019743656060348416
15 3457799186387568447755745563625

List of values

[1, 1, 12, 321, 15280, 1127745, 118507536, 16731979033, 3044595017472, 692050790547297, 191796657547052800, 63563842088104098081, 24793529117087476242432, 11232023076988690608825505, 5843573099019743656060348416, 3457799186387568447755745563625]

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

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