Number of labeled 2-trees with n nodes.

A036361

Number of labeled 2-trees with n nodes.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =6a(4) =70a(5) =1215a(6) =27951a(7) =799708a(8) =27337500a(9) =1086190605a(10) =49162945645

External references