A117253 Column 0 of triangle A117252.

1, 1, -3, 45, -2430, 433026, -245525742, 434685788658, -2376644549487615, 39849199161258840705, -2039314646436750180150939, 317469566015078743658568283029, -149970083228995077874358388356635368, 214577598849654850870918566871719460091160

Offset: 0

Author

Paul D. Hanna, Mar 14 2006

Keywords

• sign

Crossrefs

Cf. A117252.

Programs

PARI

a(n)=prod(j=0,n-1,1-3*j)/n!*3^(n*(n-1)/2)

Formula

a(n) = [Product_{j=0..n-1} (1-3*j)]/n! * 3^(n*(n-1)/2).