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

A159769

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) =1212a(9) =3885a(10) =12614a(11) =41400a(12) =137132a(13) =457841a(14) =1539150a(15) =5205612a(16) =17700450a(17) =60473476a(18) =207491052a(19) =714668954a(20) =2470156910a(21) =8564900629a(22) =29783782326a(23) =103846841946a(24) =362970362118

External references