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Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero
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%I #5 Mar 31 2012 12:37:11

%S 112,14990,9841886,31585648103,492612276280514,37329289780655758477,

%T 13716254602125340475868528,24435414110066461941469656297723

%N Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero

%C Diagonal of A206318

%e Some solutions for n=4

%e ..1..1..0..2..1....0..3..2..1..1....1..2..2..1..0....3..3..2..1..1

%e ..3..2..1..3..2....2..1..0..3..2....1..0..3..2..1....2..1..0..3..2

%e ..2..3..2..0..3....3..2..1..0..3....2..1..0..3..2....3..2..1..0..3

%e ..0..1..0..2..0....1..3..2..1..0....0..3..2..0..3....0..3..2..1..0

%e ..1..3..2..0..1....1..0..3..2..1....1..0..3..1..0....2..0..3..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 06 2012