149796873604domain: NAppears in sequencesa(n) = n! * Sum_{k=1..n-1} 1/k!.at n=14A038156Multiply by 1, add 1, multiply by 2, add 2, etc.at n=28A082459Expansion of e.g.f. (exp(x)-x)*x/(1-x).at n=14A296964