117771500domain: NAppears in sequencesDiagonal A(n,n) of array A(k,n) = Product of first n of k-gonal pyramidal numbers.at n=3A140729a(n) = (2/3)^n*Gamma(n+3/4)*Gamma(n+1)*Gamma(n+2)/Gamma(3/4).at n=6A279662