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%I #4 Mar 31 2012 12:36:09
%S 112,11282,174292,1549398,6839146,32368980,88344978,268011840
%N Number of 4X4 0..n arrays with each 2X2 subblock nonsingular and the array of 2X2 subblock determinants symmetric about the diagonal and antidiagonal
%C Row 3 of A187670
%e Some n=3 solutions for 4X4
%e ..0..1..1..2....0..2..2..2....0..2..2..3....0..2..2..2....2..1..1..2
%e ..2..0..2..3....2..0..3..0....2..0..2..1....3..0..3..1....1..0..2..2
%e ..3..1..0..1....2..3..0..2....0..2..0..2....0..2..0..2....2..2..0..1
%e ..1..0..2..1....2..0..2..1....2..2..2..1....2..1..3..3....3..2..1..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 12 2011
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