Number of planted noncrossing bushes with n nodes; i.e., rooted noncrossing trees with n nodes, root degree 1 and no nonroot nodes of degree 1.
A030980
Number of planted noncrossing bushes with n nodes; i.e., rooted noncrossing trees with n nodes, root degree 1 and no nonroot nodes of degree 1.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =4a(4) =23a(5) =66a(6) =280a(7) =1030a(8) =4207a(9) =16852a(10) =69747a(11) =289950a(12) =1222540a(13) =5192344a(14) =22239672a(15) =95864902a(16) =415730735a(17) =1812177000a(18) =7936353049a(19) =34901789568a(20) =154067755503a(21) =682428824890
External references
- oeis: A030980