%I #4 Mar 30 2012 17:40:41
%S 1,4,32,592,11904,1192384,134217728
%N Number of real n X n symmetric (+1,-1) matrices with positive permanent.
%Y Cf. A086900, A118994, A118999.
%K nonn,more
%O 1,2
%A _Giovanni Resta_, May 08 2006
