Number of ordered trees with n edges and no unary or binary nodes.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =1a(5) =4a(6) =8a(7) =13a(8) =31a(9) =71a(10) =144a(11) =318a(12) =729a(13) =1611a(14) =3604a(15) =8249a(16) =18803a(17) =42907a(18) =98858a(19) =228474a(20) =528735a(21) =1228800a(22) =2865180a(23) =6693712a(24) =15676941a(25) =36807239a(26) =86584783a(27) =204060509a(28) =481823778a(29) =1139565120