A117255 Column 0 of triangle A117254.

1, 1, -6, 224, -39424, 30277632, -98180268032, 1321338098679808, -73064711504598663168, 16493270769791857518968832, -15132641904367108441083979235328, 56258298143912014448000446346897129472, -845539117695226477286180063077230730209656832

Offset

0,3

Links

Table of n, a(n) for n=0..12.

Formula

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

Prog

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

Crossrefs

Sequence in context: A355669 A061610 A054324 * A130644 A223100 A233142

Adjacent sequences: A117252 A117253 A117254 * A117256 A117257 A117258

Keyword

sign

Author

Paul D. Hanna, Mar 14 2006

Status

approved