Number of unlabeled rooted identity trees with n nodes and a distinguished leaf.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =12a(6) =28a(7) =66a(8) =153a(9) =367a(10) =880a(11) =2121a(12) =5127a(13) =12441a(14) =30248a(15) =73746a(16) =180077a(17) =440571a(18) =1079438a(19) =2648511a(20) =6506170a(21) =16001256a(22) =39393173a(23) =97074140a(24) =239419963a(25) =590972968a(26) =1459808862a(27) =3608483107a(28) =8925476591a(29) =22090139751