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%I #6 Dec 18 2015 18:17:47
%S 1,7,30,495,16949,1300388,224664284,86035336419,73179371169968,
%T 138149268301786989
%N Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,4,0,2,3 for x=0,1,2,3,4
%C Every 0 is next to 0 1's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 3's
%C Diagonal of A196343
%e Some solutions for n=4
%e ..0..0..2..0....2..0..0..0....0..0..0..0....0..0..0..0....0..0..0..2
%e ..2..3..2..0....0..0..2..2....0..0..0..0....0..2..3..2....0..0..0..0
%e ..0..2..0..0....0..0..2..0....0..0..0..0....0..3..2..0....2..2..3..2
%e ..0..2..0..0....2..0..2..0....0..2..2..0....0..2..0..0....0..0..2..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Oct 01 2011
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