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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.

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%I A268158 #3 Jan 27 2016 12:32:56
%S A268158 0,3,14,906,23592,3304920,334738800,79401782880
%N 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.
%C A268158 Column 4 of A268159.
%e A268158 Some solutions for n=4
%e A268158 ..0..0..3..1....0..0..2..1....0..2..2..0....0..1..0..2....0..1..1..2
%e A268158 ..0..0..3..1....0..0..2..1....0..2..0..1....0..1..0..2....0..1..2..3
%e A268158 ..3..2..2..1....1..2..3..3....2..3..3..1....1..3..3..2....1..2..3..0
%e A268158 ..3..2..2..1....1..2..3..3....3..3..1..1....1..3..3..2....2..3..3..0
%Y A268158 Cf. A268159.
%K A268158 nonn
%O A268158 1,2
%A A268158 _R. H. Hardin_, Jan 27 2016

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