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A117253 Column 0 of triangle A117252. 1

%I

%S 1,1,-3,45,-2430,433026,-245525742,434685788658,-2376644549487615,

%T 39849199161258840705,-2039314646436750180150939,

%U 317469566015078743658568283029,-149970083228995077874358388356635368,214577598849654850870918566871719460091160

%N Column 0 of triangle A117252.

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

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

%K sign

%O 0,3

%A _Paul D. Hanna_, Mar 14 2006

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Last modified January 19 09:16 EST 2022. Contains 350464 sequences. (Running on oeis4.)