2362041domain: NAppears in sequencesa(n) = 3^n*(3^n-1)*(3^n-2)/6.at n=5A026809Array read by antidiagonals: A(k,n) = C(n^k, n).at n=31A108131Smallest tetrahedral number with exactly n divisors, or 0 if no such number exists.at n=29A279082Expansion of e.g.f. 1/(1 - sin(3*x) / 3).at n=9A381286