Number of totally transitive rooted trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =7a(7) =12a(8) =17a(9) =28a(10) =41a(11) =65a(12) =96a(13) =150a(14) =221a(15) =342a(16) =506a(17) =771a(18) =1142a(19) =1731a(20) =2561a(21) =3855a(22) =5702a(23) =8538a(24) =12620a(25) =18817a(26) =27774a(27) =41276a(28) =60850a(29) =90139