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.

A238914 Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 3.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 2
5 7
6 19
7 47
8 117
9 284
10 675
11 1575
12 3634
13 8312
14 18881
15 42634
16 95797
17 214376
18 478110
19 1063242
20 2358703
21 5221606
22 11538623
23 25458412
24 56095424
25 123458153
26 271440387
27 596277224
28 1308849869
29 2871054209
30 6294182153
31 13791615999
32 30206220592
33 66131277054

List of values

[0, 0, 0, 0, 2, 7, 19, 47, 117, 284, 675, 1575, 3634, 8312, 18881, 42634, 95797, 214376, 478110, 1063242, 2358703, 5221606, 11538623, 25458412, 56095424, 123458153, 271440387, 596277224, 1308849869, 2871054209, 6294182153, 13791615999, 30206220592, 66131277054]

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

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