Number of binary tree partitions.

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =72a(6) =229a(7) =740a(8) =2460a(9) =8317a(10) =28590a(11) =99556a(12) =350661a(13) =1246998a(14) =4471801a(15) =16153007a(16) =58722226a(17) =214687361a(18) =788855637a(19) =2911701588a(20) =10790952975a(21) =40139185202a(22) =149805575022a(23) =560804604385