Number of rooted trees with n nodes having some subtrees replaced by cycles such that no leaf nodes are left over.
A213682
Number of rooted trees with n nodes having some subtrees replaced by cycles such that no leaf nodes are left over.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =3a(6) =4a(7) =6a(8) =9a(9) =16a(10) =28a(11) =51a(12) =91a(13) =169a(14) =312a(15) =588a(16) =1113a(17) =2125a(18) =4068a(19) =7844a(20) =15174a(21) =29505a(22) =57553a(23) =112680a(24) =221224a(25) =435637a(26) =859958a(27) =1701775a(28) =3374860a(29) =6706722
External references
- oeis: A213682