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Number of (n+1)X(n+1) 0..5 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 170,3426,107990,8174314,1201064094

%N Number of (n+1)X(n+1) 0..5 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero

%C Column 5 of A187521

%e Some solutions for 4X4

%e ..0..0..3..2....0..5..1..1....0..0..2..0....0..0..3..0....2..2..3..1

%e ..3..2..1..2....0..5..5..1....3..4..1..1....3..5..3..5....1..1..2..2

%e ..0..2..1..3....4..3..3..3....1..4..1..3....0..5..3..4....2..1..2..1

%e ..2..1..0..0....4..4..0..0....1..2..0..0....3..4..3..4....4..0..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 10 2011