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%I #4 Mar 31 2012 12:36:09
%S 24,1648,14044,106892,306320,1848504,3549080,9810932,19774644,
%T 44235868,65964188,188874084,261388436,423186604,755637740,1198594384,
%U 1533264084,2755012728,3428332204,5907685880,8225807516
%N Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular
%C Row 3 of A187633
%e Some n=3 solutions for 4X4
%e ..2..3..3..3....1..0..0..1....3..3..3..1....0..1..1..1....0..1..2..3
%e ..2..0..0..2....2..1..1..0....2..0..0..2....2..0..0..2....2..0..0..1
%e ..3..0..0..2....2..1..1..0....2..0..0..2....1..0..0..2....1..0..0..2
%e ..3..2..3..1....3..1..1..1....1..3..3..1....1..2..1..0....3..2..1..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 12 2011
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