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Number of n X n symmetric 0..7 arrays with no element equal to the sum mod 8 of any two of its horizontal and vertical neighbors
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%I #5 Dec 18 2015 18:17:42

%S 8,343,54769,34412915,85151401909,832274517610173

%N Number of n X n symmetric 0..7 arrays with no element equal to the sum mod 8 of any two of its horizontal and vertical neighbors

%e Some solutions for 4X4

%e ..4..4..4..2....0..6..2..6....4..4..4..4....0..2..4..4....0..2..4..4

%e ..4..4..7..2....6..2..6..3....4..4..5..4....2..0..3..4....2..0..7..2

%e ..4..7..2..6....2..6..7..0....4..5..6..5....4..3..4..7....4..7..1..7

%e ..2..2..6..6....6..3..0..6....4..4..5..4....4..4..7..0....4..2..7..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 18 2011