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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.

A185408 1/7 the number of nX5 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

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%I A185408 #8 Jul 22 2025 09:45:39
%S A185408 13,22656,12205368,9560464068,6409594156632
%N A185408 1/7 the number of nX5 0..6 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
%C A185408 Column 5 of A185409
%e A185408 Some solutions for 3X5 with a(1,1)=0
%e A185408 ..0..0..1..0..1....0..0..0..5..5....0..0..0..6..6....0..0..2..2..4
%e A185408 ..0..0..1..0..1....0..1..1..3..0....0..1..1..4..4....0..1..1..6..4
%e A185408 ..4..4..2..2..2....0..0..0..3..0....3..3..3..4..4....3..3..1..6..4
%K A185408 nonn
%O A185408 1,1
%A A185408 _R. H. Hardin_ Jan 26 2011

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