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Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero
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%I #5 Mar 31 2012 12:36:08

%S 31,98,354,1780,12008,157694,2808560,115232300,6691316378

%N Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero

%C Column 2 of A187521

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 10 2011