%I
%S 9,21,41,81,153,297,569,1113,2169,4281,8441,16761,33273,66297
%N 1/9 the number of (n+1)X(n+1) 0..2 arrays with all 2X2 subblocks having the same four values
%C Diagonal of A184048
%e Some solutions for 5X5
%e ..1..0..1..0..1....1..2..1..0..1....1..0..1..0..1....0..1..0..1..0
%e ..1..0..1..0..1....0..0..0..2..0....2..0..2..0..2....1..1..1..1..1
%e ..0..1..0..1..0....1..2..1..0..1....0..1..0..1..0....1..0..1..0..1
%e ..0..1..0..1..0....0..0..0..2..0....0..2..0..2..0....1..1..1..1..1
%e ..0..1..0..1..0....1..2..1..0..1....1..0..1..0..1....0..1..0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 08 2011
