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%I #4 Dec 24 2014 15:35:16
%S 2793,30453,306680,3255537,33858062,357165303,3740990254,39381278095,
%T 413451112737,4347775265112,45683304899259,480233990713908,
%U 5047003232714437,53050317963040942,557570119871186926
%N Number of (n+2)X(2+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and new values 0 upwards introduced in row major order
%C Column 2 of A252904
%H R. H. Hardin, <a href="/A252900/b252900.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2
%e ..0..1..1..2....0..1..1..2....0..1..0..1....0..1..1..0....0..1..0..0
%e ..1..0..1..0....2..0..2..2....1..2..1..1....0..2..2..1....1..0..1..1
%e ..0..0..2..0....2..1..1..0....0..2..0..0....2..2..1..1....1..0..1..0
%e ..1..2..2..1....0..1..1..0....1..3..1..1....2..1..2..2....0..1..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 24 2014
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