725761domain: NAppears in sequencesa(n) = 2*n! + 1.at n=9A052898Number of divisors of n^(n!) (A053986).at n=8A062959a(n) = (n!+5)/5.at n=5A139152Expansion of e.g.f. Sum_{k>=1} x^k / (k! * (1 - x^k)^k).at n=8A330020Triangular array read by rows: T(n,k) = n!*k + 1, n >= 1, 1 <= k <= n.at n=37A362777