%I #7 Dec 10 2015 02:07:57
%S 256,11028,754704,70027468,8605131924,1498787263308,451135236949228
%N Number of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors.
%C Diagonal of A205944.
%e Some solutions for n=4:
%e ..0..0..3..1..1....3..3..1..3..3....0..1..0..3..3....0..1..2..3..2
%e ..0..2..0..0..0....0..0..2..2..2....1..3..3..3..3....0..0..2..0..3
%e ..1..3..0..2..1....0..0..1..2..2....1..2..3..3..0....0..0..3..2..2
%e ..2..3..0..3..2....3..3..2..3..3....1..1..2..2..1....0..2..0..2..0
%e ..3..3..1..0..2....2..0..3..3..3....1..1..1..3..2....1..3..0..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 01 2012
