67009domain: NAppears in sequencesSort then Add, a(1)=5.at n=15A033894Sort then Add, a(1)=31.at n=12A033905Sort then Add, a(1)=20.at n=13A033906Number of unlabeled semi-binary rooted trees with n nodes in which the non-leaf branches directly under any given node are all equal.at n=23A320271