Number of n-leaf binary trees that do not contain (()((()())((()())()))) as a subtree.

A159771

Number of n-leaf binary trees that do not contain (()((()())((()())()))) as a subtree.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =41a(6) =124a(7) =385a(8) =1220a(9) =3929a(10) =12822a(11) =42309a(12) =140922a(13) =473169a(14) =1599864a(15) =5442561a(16) =18615176a(17) =63975857a(18) =220816906a(19) =765121477a(20) =2660426630a(21) =9280204025a(22) =32466050612a(23) =113883898241a(24) =400464335116

External references