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%I #52 Jan 25 2023 13:57:07
%S 1,4,96,384,30720,7372800,4335206400,2477260800,25684239974400,
%T 7191587192832000
%N Number of n X n (real) {-1,1}-matrices having determinant A003433(n).
%H Minfeng Wang, <a href="/A188895/a188895.txt">C++ program to calculate a(2) .. a(5)</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HadamardsMaximumDeterminantProblem.html">Hadamard's Maximum Determinant Problem</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/-11-Matrix.html">(-1, 1)-Matrix</a>
%F a(n) = 2^(2n+1) * A051752(n) for n>=2. - _Hugo Pfoertner_ and _Minfeng Wang_, Jan 22 2023
%Y Cf. A003433, A051752.
%K nonn,more,hard
%O 0,2
%A _Eric W. Weisstein_, Apr 19 2011
%E Offset changed to 0 by _Hugo Pfoertner_, Jan 23 2023
%E a(5)-a(9) from _Minfeng Wang_, Jan 22 2023
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