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%I #5 Dec 18 2015 18:17:42
%S 4,64,4096,1048580,1073745920,4398046511104,72057594037927936
%N Number of n X n symmetric 0..4 arrays with no element equal to the sum mod 5 of all its horizontal and vertical neighbors
%e Some solutions for 4X4
%e ..1..0..4..3....1..0..3..3....1..0..2..2....0..1..4..4....0..1..3..4
%e ..0..2..0..3....0..2..3..3....0..4..3..1....1..1..1..1....1..0..1..0
%e ..4..0..0..4....3..3..1..4....2..3..3..3....4..1..4..3....3..1..1..4
%e ..3..3..4..0....3..3..4..1....2..1..3..2....4..1..3..4....4..0..4..4
%K nonn
%O 1,1
%A _R. H. Hardin_ Jul 31 2011
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