Number of labeled rooted unordered binary trees (each node has out-degree <= 2).

A036774

Number of labeled rooted unordered binary trees (each node has out-degree <= 2).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =9a(4) =60a(5) =540a(6) =6120a(7) =83790a(8) =1345680a(9) =24811920a(10) =516650400a(11) =11992503600a(12) =307069963200

External references