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%I #6 Dec 18 2015 18:17:54
%S 1,2,82,2910,407810,243912221,520354155777,3409407617142917,
%T 73436526718582338337
%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 4,2,2,0,2 for x=0,1,2,3,4
%C Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 2's, every 3 is next to 3 0's, every 4 is next to 4 2's
%C Diagonal of A197648
%e Some solutions for n=4
%e ..0..0..1..1....0..0..3..0....2..2..2..1....0..2..2..0....2..2..2..1
%e ..3..0..2..2....0..3..0..0....2..4..2..0....0..2..2..1....2..0..2..1
%e ..0..1..2..2....1..2..2..0....2..2..2..0....0..0..1..0....2..2..2..1
%e ..0..0..0..1....0..2..2..0....0..1..0..0....0..3..0..0....1..0..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Oct 16 2011