A117259 Column 0 of triangle A117258.

1, 1, -2, 32, -2560, 917504, -1409286144, 9070970929152, -241505530017742848, 26378844025404658810880, -11755594669932654094842855424, 21291459481433341027538627037495296, -156279993920424129009046403691280672489472

Offset: 0

Author

Paul D. Hanna, Mar 14 2006

Keywords

• sign

Programs

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)}

Formula

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