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%I #3 Mar 31 2012 12:35:07
%S 1,2,3,19,93,1575,21225,1007325,39296735,5294789855,584025270873,
%T 223173910768577,70041418150889563,76024730608891641301,
%U 67725956302664583147084,208747768532396398250753135,528233319697505378983008951127
%N Number of n X n binary matrices, symmetric under 180 degree 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
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