%I
%S 1,2,1,5,7,49,93,1237,4141,89949,498037,18459425,173151965,
%T 10776871089,170022693228,17856702680623,475042622997955,
%U 84045266807297263,3767160477564182682,1123350438602153100399,84860275331624989832681,42642871075536884664453747
%N Number of n X n binary matrices, symmetric under 90degree rotation, with no more than 2 ones in any 2 X 2 subblock.
%K nonn
%O 0,2
%A _R. H. Hardin_, Aug 10 2008
