100871domain: NAppears in sequencesExpansion of Product_{i>=1} (1-x^i)^(1/i); also of exp(- Sum_{n>=1}(d(n)*x^n/n)) where d(n) is the number of divisors of n.at n=10A028343Number of forests of rooted trees with total weight n, where a node at height k has weight 2^k (with root considered to be at height 0).at n=48A115593