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%I #5 Mar 31 2012 12:37:10
%S 50,798,25340,2501248,619611200,372768662926,529835514016558,
%T 1784953478369789594,14217384542781343057074,
%U 268389362522364377038143786
%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors
%C Diagonal of A206128
%e Some solutions for n=4
%e ..0..1..2..0..2....1..2..1..1..1....2..2..2..1..0....2..1..2..1..1
%e ..1..2..0..1..0....1..1..1..0..1....1..2..1..1..2....1..2..1..0..2
%e ..0..1..2..2..1....1..2..1..1..1....1..1..1..2..2....1..0..2..1..0
%e ..2..0..1..0..2....2..2..2..1..2....2..1..2..2..1....2..1..0..2..1
%e ..1..1..0..1..0....0..1..2..2..2....1..1..1..2..2....0..2..1..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 04 2012
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