Number of noncrossing nonplanted bushes with n nodes, i.e., rooted noncrossing trees with n nodes and no nodes of degree 1.

A030982

Number of noncrossing nonplanted bushes with n nodes, i.e., rooted noncrossing trees with n nodes and no nodes of degree 1.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =7a(4) =18a(5) =80a(6) =284a(7) =1169a(8) =4628a(9) =19137a(10) =79165a(11) =333058a(12) =1410608a(13) =6029816a(14) =25941384a(15) =112315945a(16) =488862888a(17) =2138161043a(18) =9391903131a(19) =41414729419a(20) =183264846010a(21) =813564012660

External references