326053domain: NAppears in sequencesNumber of bipartite connected outerplanar graphs on n unlabeled nodes.at n=14A111758Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).at n=41A123353Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).at n=5A123356