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A117253
Column 0 of triangle A117252.
1
1, 1, -3, 45, -2430, 433026, -245525742, 434685788658, -2376644549487615, 39849199161258840705, -2039314646436750180150939, 317469566015078743658568283029, -149970083228995077874358388356635368, 214577598849654850870918566871719460091160
OFFSET
0,3
FORMULA
a(n) = [Product_{j=0..n-1} (1-3*j)]/n! * 3^(n*(n-1)/2).
PROG
(PARI) a(n)=prod(j=0, n-1, 1-3*j)/n!*3^(n*(n-1)/2)
CROSSREFS
Cf. A117252.
Sequence in context: A331710 A283698 A163002 * A012833 A012747 A210933
KEYWORD
sign
AUTHOR
Paul D. Hanna, Mar 14 2006
STATUS
approved