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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.

A324366 Number of permutations p of [n] having at least one index i with |p(i)-i| = 3.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 10
5 67
6 455
7 3486
8 29296
9 272064
10 2782768
11 31112974
12 377989835
13 4961822943
14 70010940186
15 1056948399594
16 17002714972374
17 290376470114307
18 5247488148645251
19 100046090532522600
20 2006982109206921472
21 42259647960510173184
22 931935465775791556864

List of values

[0, 0, 0, 0, 10, 67, 455, 3486, 29296, 272064, 2782768, 31112974, 377989835, 4961822943, 70010940186, 1056948399594, 17002714972374, 290376470114307, 5247488148645251, 100046090532522600, 2006982109206921472, 42259647960510173184, 931935465775791556864]

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

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