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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.

A245507 Number of endofunctions f on [n] such that f^n(i) = f(i) for all i in [n].

Table of values

n a(n)
0 1
1 1
2 3
3 19
4 73
5 901
6 1921
7 112015
8 87473
9 14154409
10 69703201
11 2929242031
12 679876297
13 3090182325361
14 107695177409
15 442870698673621
16 7233741446307841
17 475492243447425745
18 6964488144903745
19 672629401563923828521
20 2588222103446878841
21 615608908275758056730701

List of values

[1, 1, 3, 19, 73, 901, 1921, 112015, 87473, 14154409, 69703201, 2929242031, 679876297, 3090182325361, 107695177409, 442870698673621, 7233741446307841, 475492243447425745, 6964488144903745, 672629401563923828521, 2588222103446878841, 615608908275758056730701]

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

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