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

A159770

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) =384a(8) =1211a(9) =3875a(10) =12548a(11) =41040a(12) =135370a(13) =449791a(14) =1504057a(15) =5057668a(16) =17092030a(17) =58018150a(18) =197727023a(19) =676290905a(20) =2320721255a(21) =7987481185a(22) =27566740439a(23) =95379299734a(24) =330774138321

External references