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.

A239768 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(x) = f(g(f(x))).

Table of values

n a(n)
0 1
1 1
2 10
3 195
4 6808
5 362745
6 26848656
7 2621263519
8 324981308800
9 49669569764433
10 9146879704748800
11 1993011341241988551
12 506190915590699695104
13 148000190814308473203433
14 49289886405448749446514688
15 18529196186934893511062427375
16 7800708229072237749055062900736
17 3652486190893312491910941333813537

List of values

[1, 1, 10, 195, 6808, 362745, 26848656, 2621263519, 324981308800, 49669569764433, 9146879704748800, 1993011341241988551, 506190915590699695104, 148000190814308473203433, 49289886405448749446514688, 18529196186934893511062427375, 7800708229072237749055062900736, 3652486190893312491910941333813537]

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

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