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%I #7 Dec 10 2015 02:03:52
%S 256,25512,5550256,2938041784,4762415402596
%N Number of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors.
%C Diagonal of A205954.
%e Some solutions for n=4:
%e ..0..1..2..3..2....0..2..1..3..3....2..1..1..0..0....3..3..0..3..1
%e ..2..0..3..1..1....1..3..3..2..2....3..1..1..0..0....1..3..2..2..1
%e ..1..0..2..2..1....3..3..3..2..2....2..1..2..1..2....1..2..3..3..2
%e ..3..0..3..1..0....3..3..0..3..0....2..3..1..1..3....0..2..3..3..2
%e ..2..1..2..1..0....0..0..1..2..0....0..3..1..1..2....1..1..2..2..3
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 02 2012
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