%I #5 Dec 18 2015 18:17:42
%S 0,4,24,989,93061,31790896,29561132743,83415272837037,
%T 713619852188928603
%N Number of n X n symmetric 0..5 arrays with each element equal to the product mod 6 of two of its horizontal and vertical neighbors
%e Some solutions for 4X4
%e ..1..5..2..2....1..1..1..3....4..4..4..4....0..0..1..1....4..2..2..0
%e ..5..5..1..1....1..1..1..3....4..4..2..4....0..1..1..1....2..2..4..0
%e ..2..1..1..1....1..1..1..4....4..2..2..4....1..1..3..3....2..4..4..4
%e ..2..1..1..1....3..3..4..4....4..4..4..4....1..1..3..3....0..0..4..4
%K nonn
%O 1,2
%A _R. H. Hardin_ Jul 27 2011