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

A032027

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =13a(6) =35a(7) =95a(8) =255a(9) =715a(10) =2081a(11) =6003a(12) =17645a(13) =52127a(14) =155863a(15) =468129a(16) =1415521a(17) =4301055a(18) =13134789a(19) =40275109a(20) =123970669a(21) =382919917a(22) =1186475687a(23) =3686899725a(24) =11487023793a(25) =35876838669a(26) =112304155021a(27) =352276801491

External references