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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.

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%I A267900 #3 Jan 22 2016 07:09:59
%S A267900 1,11,268,17658,1696920,273460560,59383337040
%N 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.
%C A267900 Column 4 of A267901.
%e A267900 Some solutions for n=4
%e A267900 ..0..0..1..3....0..3..2..2....0..0..1..1....0..2..2..1....0..0..1..1
%e A267900 ..2..2..1..3....0..3..0..0....2..2..3..0....0..1..1..1....0..0..3..3
%e A267900 ..1..0..2..2....2..1..1..3....1..2..3..0....3..2..3..3....2..3..2..2
%e A267900 ..1..0..3..3....2..1..1..3....1..2..3..3....3..2..0..0....2..3..1..1
%Y A267900 Cf. A267901.
%K A267900 nonn
%O A267900 1,2
%A A267900 _R. H. Hardin_, Jan 22 2016

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