63192domain: NAppears in sequencesa(n) = Sum_t t*F(n,t), where F(n,t) is the number of forests with n (unlabeled) nodes and exactly t trees, all of which are planted (that is, rooted trees in which the root has degree 1).at n=14A005199a(n) = Sum_{k=0..floor(3*n/8)} binomial(3*n-7*k,k).at n=19A392349