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Number of 4X4 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal
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%I #4 Mar 31 2012 12:36:09

%S 2,72,322,1718,2904,9834,13324,31000,49910,84760,98226,211526,234336,

%T 325654,454612,691052,742006,1152832,1224538,1765938

%N Number of 4X4 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal

%C Row 3 of A187705

%e Some n=3 solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2011