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%I #10 Jun 21 2022 19:58:18
%S 2,8,192,22272,11550720,25629327360,236229525504000,
%T 8858686914082897920,1331751782100764385607680
%N Number of nonsingular n X n (-1,1)-matrices.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/NonsingularMatrix.html">Nonsingular Matrix.</a>
%F a(n) = 2^(2*n-1) * A055165(n-1).
%Y Cf. A055165, A056989.
%K nonn,nice
%O 1,1
%A _Eric W. Weisstein_
%E a(5) from Winston C. Yang (winston(AT)cs.wisc.edu), Aug 26 2000
%E a(6)-a(8) computed from A055165 by _David desJardins_, Apr 22 2001
%E a(9) from _Max Alekseyev_, computed from A055165, Jan 15 2007
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