%I #13 May 29 2024 08:27:03
%S 1,2,8,192,22272,11550720,25629327360,236229525504000,
%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) for n>=1.
%Y Cf. A055165, A056989.
%K nonn,nice
%O 0,2
%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
%E a(0)=1 prepended by _Alois P. Heinz_, May 29 2024