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%I #5 Mar 31 2012 12:35:54
%S 1,813,8538066,1163575148283,2051388696859571241
%N 1/256 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor
%C Diagonal of A183827
%e Some solutions with upper left block zero for 3X3
%e ..0..0..1....0..0..3....0..0..1....0..0..0....0..0..3....0..0..1....0..0..3
%e ..0..0..0....0..0..3....0..0..0....0..0..3....0..0..2....0..0..3....0..0..3
%e ..1..1..3....2..1..1....0..2..1....2..1..0....2..2..2....0..2..1....1..3..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 07 2011