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Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero
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%I #4 Mar 31 2012 12:36:08

%S 64,450,4200,73764,2048596,129034386,13881494364

%N Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero

%C Column 3 of A187521

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 10 2011