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%I #21 Jan 17 2019 18:32:33
%S 0,8,320,43264,22003712,43090149376,326720427917312,
%T 9588057159626653696,1086099857128493963804672
%N Number of singular n X n (-1,1)-matrices.
%C a(n) = 2^(2n-1)*A046747(n-1). - Kevin Costello, May 18 2005
%H R. P. Brent and J. H. Osborn, <a href="http://arxiv.org/abs/1208.3330">Bounds on minors of binary matrices</a>, arXiv preprint arXiv:1208.3330 [math.CO], 2012. - From _N. J. A. Sloane_, Dec 25 2012
%H Konstantin Tikhomirov, <a href="https://arxiv.org/abs/1812.09016">Singularity of random Bernoulli matrices</a>, arXiv preprint arXiv:1812.09016 [math.PR], 2018-2019.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SingularMatrix.html">Singular Matrix.</a>
%F a(n)/2^(n^2) ~ (1/2 + o_n(1))^n (proved by Tikhomirov). - _Timothy Y. Chow_, Jan 17 2019
%Y Complement of A056990.
%Y Cf. A046747.
%K nonn,more
%O 1,2
%A _Eric W. Weisstein_, Oct 23 2000
%E More terms from Kevin Costello, May 18 2005
%E a(6)-a(9) from Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 18 2008
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