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Column 0 of triangle A117258.
1

%I #4 Mar 30 2012 18:36:56

%S 1,1,-2,32,-2560,917504,-1409286144,9070970929152,-241505530017742848,

%T 26378844025404658810880,-11755594669932654094842855424,

%U 21291459481433341027538627037495296,-156279993920424129009046403691280672489472

%N Column 0 of triangle A117258.

%F a(n) = [prod_{j=0..n-1} (1-2*j)]/n! * 4^(n*(n-1)/2).

%o (PARI) {a(n)=local(m=1,p=2,q=4,r=1);prod(j=0,n-1,m*r-p*j)/n!*q^(n*(n-1)/2)}

%K sign

%O 0,3

%A _Paul D. Hanna_, Mar 14 2006