51561domain: NAppears in sequencesNumber of rooted trees with n nodes with every leaf at the same height.at n=24A048816Number of monocyclic skeletons with n carbon atoms and a ring size of 6.at n=11A120779a(n) = Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k+1,2*n-6*k+1).at n=24A387652