%I
%S 31,1489,72,5030,36,7410,474,176936
%N Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal
%C Column 2 of A187705
%e Some solutions for 4X4
%e ..0..2..0..0....0..0..1..1....0..0..2..1....0..2..0..0....0..0..1..0
%e ..0..1..1..1....2..1..1..1....2..1..2..1....0..2..1..2....2..2..1..0
%e ..2..2..2..0....1..1..1..2....0..1..2..2....1..2..1..0....1..2..1..2
%e ..0..0..1..0....1..1..0..0....0..1..0..0....0..0..1..0....1..2..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 12 2011
