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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.

A267900 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.

Table of values

n a(n)
1 1
2 11
3 268
4 17658
5 1696920
6 273460560
7 59383337040

List of values

[1, 11, 268, 17658, 1696920, 273460560, 59383337040]

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

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