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%I #5 Mar 31 2012 12:37:11
%S 81,7737,2105607,1483188648,2671430859687,12197461566772314,
%T 140477097763717169946
%N Number of (n+1)X(n+1) 0..2 arrays with the number of clockwise edge increases in 2X2 subblocks nondecreasing rightwards and downwards
%C Diagonal of A206512
%e Some solutions for n=4
%e ..1..2..0..1..1....1..0..2..1..1....0..2..1..2..1....2..0..1..0..1
%e ..2..1..1..0..2....1..2..1..0..2....1..1..1..2..0....2..0..2..1..0
%e ..1..0..2..1..0....1..1..0..1..0....1..2..2..1..1....2..1..0..2..1
%e ..2..1..0..2..1....2..2..1..2..1....1..1..1..0..2....0..2..1..0..2
%e ..0..2..1..0..2....0..1..2..1..0....0..0..2..1..0....1..0..2..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 08 2012