23395domain: NAppears in sequencesG.f.: Sum_{n>=0} x^n / Product_{d|n} (1-d*x).at n=10A205544Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 7.at n=52A245147Odd semiprimes p*q, such that Stern polynomial B(p*q,x) is a product of B(p,x) and B(q,x).at n=50A391256