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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.

A268158 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0.

Table of values

n a(n)
1 0
2 3
3 14
4 906
5 23592
6 3304920
7 334738800
8 79401782880

List of values

[0, 3, 14, 906, 23592, 3304920, 334738800, 79401782880]

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

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