Number of rooted planar trees (n+1 nodes) where any 2 subtrees extending from same node are different.

A032028

Number of rooted planar trees (n+1 nodes) where any 2 subtrees extending from same node are different.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =23a(7) =62a(8) =167a(9) =461a(10) =1309a(11) =3784a(12) =11018a(13) =32431a(14) =96294a(15) =288246a(16) =868107a(17) =2629499a(18) =8005166a(19) =24482202a(20) =75177313a(21) =231697259a(22) =716488213a(23) =2222381516a(24) =6912569477a(25) =21556270329a(26) =67380727837a(27) =211080434346

External references