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%I #5 Mar 31 2012 12:37:09
%S 26,498,22612,2437024,619044912,372736115952,529835251171222,
%T 1784953426699556450,14217384542435576039962,
%U 268389362522048765430516260,11988698179720320887135239667414,1269247322036771438138592002629758982
%N Number of (n+1)X(n+1) 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero
%C Diagonal of A205998
%e Some solutions for n=4
%e ..2..2..0..2..1....2..2..0..1..0....2..0..1..0..2....0..1..0..2..2
%e ..1..0..1..0..2....1..0..1..0..1....2..1..0..2..0....2..0..2..1..0
%e ..0..1..0..1..0....2..1..2..1..2....0..2..1..0..2....0..1..0..2..1
%e ..1..2..1..2..1....0..2..1..0..1....1..0..2..1..0....1..0..2..0..2
%e ..1..0..2..0..2....1..0..2..1..0....2..1..0..2..1....0..1..0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 02 2012
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