45328domain: NAppears in sequencesArrays of dumbbells.at n=8A002889Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 9.at n=14A244710G.f. A(x) satisfies: 1 = Sum_{n>=0} ((1+x)^(2*n) - A(x))^n.at n=5A321602