%I #5 Dec 18 2015 18:17:42
%S 0,4,46,2731,700180,861416011,4011951942490
%N Number of n X n symmetric 0..6 arrays with each element equal to the product mod 7 of two of its horizontal and vertical neighbors
%e Some solutions for 4X4
%e ..1..6..6..1....0..0..3..4....1..1..1..6....0..0..0..0....4..2..4..2
%e ..6..1..1..6....0..0..6..6....1..6..6..6....0..0..1..1....2..2..4..4
%e ..6..1..6..6....3..6..1..1....1..6..1..1....0..1..1..1....4..4..2..1
%e ..1..6..6..1....4..6..1..1....6..6..1..1....0..1..1..1....2..4..1..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jul 27 2011