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%I #16 Dec 16 2019 11:28:24
%S 0,1,33,7875,15099201,237634987683
%N Number of singular n X n (-1,0,1)-matrices.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SingularMatrix.html">Singular Matrix.</a>
%F a(n) = A060722(n) - A056989(n). - _Alois P. Heinz_, Dec 02 2019
%Y Complement of A056989.
%Y Cf. A060722, A330134.
%K nonn,more
%O 0,3
%A _Eric W. Weisstein_, Oct 23 2000
%E a(5) from _Giovanni Resta_, Feb 20 2009
%E a(0)=0 prepended by _Alois P. Heinz_, Dec 02 2019
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