%I #2 Mar 30 2012 17:40:41
%S 0,4,0,192,8960,371200,0
%N Number of symmetric n X n (+1,-1)-matrices over the reals with zero permanent.
%Y Cf. A086906, A088672, A118990, A118993.
%K nonn,more
%O 1,2
%A _Giovanni Resta_, May 08 2006
