632102486400domain: NAppears in sequencesa(n) = Product_{k = 1..n-1} (9*k - 3).at n=8A147630Triangle T(n, k) read by rows: row n gives the coefficients of the numerator polynomials of the o.g.f. of the (n+1)-th diagonal of the Sheffer triangle A282629 (S2[3,1] generalized Stirling2), for n >= 0.at n=44A290316