Number of trees with n nodes and 9 leaves.

Terms

a(0) =1a(1) =4a(2) =20a(3) =83a(4) =318a(5) =1095a(6) =3495a(7) =10292a(8) =28389a(9) =73586a(10) =180663a(11) =421949a(12) =942537a(13) =2021060a(14) =4176507a(15) =8342823a(16) =16157071a(17) =30410396a(18) =55755744a(19) =99773709a(20) =174579270a(21) =299163528a(22) =502804996a(23) =829905792a(24) =1346834873a(25) =2151396469