%I #4 Mar 31 2012 12:36:09

%S 104,7954,87258,692410,2363474,10839282,23999702,69386216,148926738

%N Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection

%C Row 3 of A187699

%e Some n=3 solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2011