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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.

A185902 1/8 the number of nX5 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

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%I A185902 #8 Jul 22 2025 10:07:35
%S A185902 15,38731,28967421,32611077940,30884279980274
%N A185902 1/8 the number of nX5 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
%C A185902 Column 5 of A185903
%e A185902 Some solutions for 3X5 with a(1,1)=0
%e A185902 ..0..4..0..0..4....0..0..6..6..6....0..0..0..2..6....0..0..6..6..0
%e A185902 ..0..4..6..0..4....4..4..4..0..0....0..4..4..2..6....4..4..4..0..0
%e A185902 ..0..4..6..0..4....0..0..4..5..5....0..0..4..2..6....4..0..0..7..7
%K A185902 nonn
%O A185902 1,1
%A A185902 _R. H. Hardin_ Feb 06 2011

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