423361domain: NAppears in sequencesa(n) = n! * sum 1/k! where the sum is over all positive integers k that divide n.at n=8A057625a(n) = n!*Sum_{d|n} (-1)^(d+1)/d!.at n=8A132958a(n) = n! * Sum_{d|n} (-1)^(n - d) / (n/d)!.at n=8A327243Expansion of e.g.f. Sum_{k>=1} sinh(x^k).at n=8A330254