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%I #5 Mar 31 2012 12:36:08
%S 6,0,104,0,9346,0,4278774,0,9966039904,0,118222727145122,0,
%T 7149579817467705382,0,2205539783282634028931328
%N Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation
%C Column 1 of A187528
%e Some solutions for 4X4
%e ..0..1..0..1....1..1..0..1....1..0..1..1....1..0..1..0....1..1..0..1
%e ..1..0..1..0....1..0..1..0....0..1..0..1....0..1..0..1....1..0..1..1
%e ..0..1..1..1....0..1..0..1....1..0..1..0....1..1..1..0....1..1..0..1
%e ..1..0..1..0....1..1..1..1....0..1..1..1....0..1..0..1....1..0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 10 2011
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