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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.

A185823 1/5 the number of n X 7 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

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%I A185823 #8 Jun 17 2022 14:55:22
%S A185823 65,426928,956312244,2852526229300,7662203273902712
%N A185823 1/5 the number of n X 7 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
%C A185823 Column 7 of A185825.
%e A185823 Some solutions for 4 X 7 with a(1,1)=0
%e A185823 ..0..0..0..3..3..1..2....0..0..0..2..2..2..0....0..0..0..1..4..4..0
%e A185823 ..0..1..0..1..2..1..2....0..1..0..1..1..0..0....0..1..0..1..3..3..0
%e A185823 ..0..1..0..1..2..1..2....0..1..0..1..0..1..1....0..1..0..1..0..4..4
%e A185823 ..0..0..0..1..0..0..2....0..0..0..1..0..0..0....0..0..0..1..0..3..3
%Y A185823 Cf. A185825.
%K A185823 nonn
%O A185823 1,1
%A A185823 _R. H. Hardin_, Feb 05 2011

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