Number of recursively anti-transitive rooted trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =11a(6) =26a(7) =52a(8) =119a(9) =266a(10) =618a(11) =1432a(12) =3402a(13) =8093a(14) =19505a(15) =47228a(16) =115244a(17) =282529a(18) =696388a(19) =1723400