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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.

A219706 Total number of nonrecurrent elements in all functions f:{1,2,...,n}->{1,2,...,n}.

Table of values

n a(n)
0 0
1 0
2 2
3 30
4 456
5 7780
6 150480
7 3279234
8 79775360
9 2146962024
10 63397843200
11 2039301671110
12 71007167075328
13 2661561062560140
14 106874954684266496
15 4577827118698118250
16 208369657238965616640
17 10044458122057793060176
18 511225397403604416921600

List of values

[0, 0, 2, 30, 456, 7780, 150480, 3279234, 79775360, 2146962024, 63397843200, 2039301671110, 71007167075328, 2661561062560140, 106874954684266496, 4577827118698118250, 208369657238965616640, 10044458122057793060176, 511225397403604416921600]

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

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