Number of unlabeled rooted trees with n leaves in which the degrees of the root and all internal nodes are >= 3.
A052525
Number of unlabeled rooted trees with n leaves in which the degrees of the root and all internal nodes are >= 3.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =3a(7) =6a(8) =10a(9) =20a(10) =36a(11) =71a(12) =136a(13) =270a(14) =531a(15) =1070a(16) =2147a(17) =4367a(18) =8895a(19) =18262a(20) =37588a(21) =77795a(22) =161444a(23) =336383a(24) =702732a(25) =1472582a(26) =3093151a(27) =6513402a(28) =13744384a(29) =29063588
External references
- oeis: A052525