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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.

A190826 Number of permutations of 3 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 1.

Table of values

n a(n)
0 1
1 0
2 1
3 29
4 1721
5 163386
6 22831355
7 4420321081
8 1133879136649
9 372419001449076
10 152466248712342181
11 76134462292157828285
12 45552714996556390334921
13 32173493282909179882613934
14 26487410329744429030530295991
15 25143126122564855343240882599761
16 27260957330891104469298062949026065

List of values

[1, 0, 1, 29, 1721, 163386, 22831355, 4420321081, 1133879136649, 372419001449076, 152466248712342181, 76134462292157828285, 45552714996556390334921, 32173493282909179882613934, 26487410329744429030530295991, 25143126122564855343240882599761, 27260957330891104469298062949026065]

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

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