%I #2 Mar 30 2012 17:40:41
%S 0,0,32,240,11904,533568,134217728
%N Number of real n X n symmetric (+1,-1) matrices with negative permanent.
%Y Cf. A118997, A118995.
%K nonn,more
%O 1,3
%A _Giovanni Resta_, May 08 2006