Number of unlabeled semi-binary rooted trees with n nodes in which the non-leaf branches directly under any given node are all equal.

A320271

Number of unlabeled semi-binary rooted trees with n nodes in which the non-leaf branches directly under any given node are all equal.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =17a(7) =26a(8) =46a(9) =72a(10) =124a(11) =196a(12) =329a(13) =525a(14) =871a(15) =1396a(16) =2293a(17) =3689a(18) =6028a(19) =9717a(20) =15817a(21) =25534a(22) =41475a(23) =67009a(24) =108680a(25) =175689a(26) =284698a(27) =460387a(28) =745610a(29) =1205997

External references