A117257 Column 0 of triangle A117256.

1, 1, -10, 750, -328125, 779296875, -9741210937500, 630569458007812500, -209368765354156494140625, 354400253854691982269287109375, -3045627181563759222626686096191406250, 132489108572997338342247530817985534667968750

Offset: 0

Author

Paul D. Hanna, Mar 14 2006

Keywords

• sign

Programs

PARI

{a(n)=local(m=1,p=5,q=5,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} (1-5*j)]/n! * 5^(n*(n-1)/2).