Number of ordered rooted trees with n nodes, at least half of which are leaves.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =7a(5) =31a(6) =66a(7) =302a(8) =715a(9) =3313a(10) =8398a(11) =39095a(12) =104006a(13) =484706a(14) =1337220a(15) =6227730a(16) =17678835a(17) =82204045a(18) =238819350a(19) =1108202513a(20) =3282060210a(21) =15195242478a(22) =45741281820a(23) =211271435479a(24) =644952073662