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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.

A190314 The number of cycles in the digraph representation of all endofunctions on {1,2,...,n}.

Table of values

n a(n)
0 0
1 1
2 5
3 38
4 390
5 5049
6 78960
7 1447886
8 30461872
9 723267369
10 19130274880
11 557794986814
12 17775137850624
13 614607897664305
14 22917282895782912
15 916671255921364950
16 39152092883971954688
17 1778431981539189344177
18 85607684151779322519552
19 4353142694568849287025142
20 233169669255877689516032000

List of values

[0, 1, 5, 38, 390, 5049, 78960, 1447886, 30461872, 723267369, 19130274880, 557794986814, 17775137850624, 614607897664305, 22917282895782912, 916671255921364950, 39152092883971954688, 1778431981539189344177, 85607684151779322519552, 4353142694568849287025142, 233169669255877689516032000]

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

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