Number of transitive rooted trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =8a(7) =13a(8) =21a(9) =34a(10) =55a(11) =88a(12) =143a(13) =229a(14) =370a(15) =592a(16) =955a(17) =1527a(18) =2457a(19) =3929a(20) =6304a(21) =10081a(22) =16147a(23) =25802a(24) =41265a(25) =65912a(26) =105279a(27) =168043a(28) =268164a(29) =427739