%I #5 Dec 18 2015 18:17:41

%S 0,3,39,1881,462153,536702346,2300614078203

%N Number of n X n symmetric 0..5 arrays with each element equal to the sum mod 6 of two of its horizontal and vertical neighbors

%e Some solutions for 4X4

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

%e ..0..0..5..1....4..2..5..1....1..5..4..2....2..2..0..0....4..2..1..5

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jul 16 2011