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%I #4 Mar 30 2012 17:40:41
%S 1,4,16,80,8448,907904,81949952
%N Number of real n X n symmetric (+1,-1) matrices with negative determinant.
%F a(2n+1) = A118994(2n+1) [From _Max Alekseyev_, May 08 2009]
%Y Cf. A118999, A118994.
%K nonn,more
%O 1,2
%A _Giovanni Resta_, May 08 2006
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