%I #6 Dec 18 2015 18:17:42
%S 2,6,64,1026,32832,2097152,268435456,68719348224,35184372089856,
%T 36028797018963968,73786976297388343296
%N Number of n X n symmetric 0..2 arrays with no element equal to the sum mod 3 of all its horizontal and vertical neighbors
%e Some solutions for 4X4
%e ..0..2..2..0....2..0..2..2....1..0..1..1....2..2..0..0....1..1..0..2
%e ..2..2..1..2....0..0..1..2....0..2..2..1....2..1..2..2....1..2..1..1
%e ..2..1..2..2....2..1..1..0....1..2..2..0....0..2..1..2....0..1..0..0
%e ..0..2..2..0....2..2..0..1....1..1..0..1....0..2..2..0....2..1..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jul 31 2011
|