%I #4 Mar 30 2012 18:36:56
%S 1,1,-10,750,-328125,779296875,-9741210937500,630569458007812500,
%T -209368765354156494140625,354400253854691982269287109375,
%U -3045627181563759222626686096191406250,132489108572997338342247530817985534667968750
%N Column 0 of triangle A117256.
%F a(n) = [prod_{j=0..n-1} (1-5*j)]/n! * 5^(n*(n-1)/2).
%o (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)}
%K sign
%O 0,3
%A _Paul D. Hanna_, Mar 14 2006