Number of rooted identity trees with n nodes (rooted trees whose automorphism group is the identity group).

A004111

Number of rooted identity trees with n nodes (rooted trees whose automorphism group is the identity group).

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =6a(7) =12a(8) =25a(9) =52a(10) =113a(11) =247a(12) =548a(13) =1226a(14) =2770a(15) =6299a(16) =14426a(17) =33209a(18) =76851a(19) =178618a(20) =416848a(21) =976296a(22) =2294224a(23) =5407384a(24) =12780394a(25) =30283120a(26) =71924647a(27) =171196956a(28) =408310668a(29) =975662480

External references