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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.

A185824 1/5 the number of nX8 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

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%I A185824 #8 Jul 22 2025 10:02:28
%S A185824 181,3701360,26231137608,247462638659680,2112817100467905536
%N A185824 1/5 the number of nX8 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
%C A185824 Column 8 of A185825
%e A185824 Some solutions for 4X8 with a(1,1)=0
%e A185824 ..0..0..0..0..2..2..2..2....0..0..0..0..4..4..3..3....0..0..0..0..3..3..2..2
%e A185824 ..0..1..1..0..0..3..3..1....0..1..1..0..0..1..3..3....0..1..1..0..0..3..3..3
%e A185824 ..0..0..0..1..1..0..0..1....0..0..0..1..1..1..4..4....0..0..0..1..1..2..2..2
%e A185824 ..1..1..0..0..0..0..1..1....1..1..0..0..0..0..0..4....1..1..0..0..0..0..0..2
%K A185824 nonn
%O A185824 1,1
%A A185824 _R. H. Hardin_ Feb 05 2011

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