Number of planar embedded labeled trees with n nodes: (2*n-3)!/(n-1)! for n >= 2, a(1) = 1.

A006963

Number of planar embedded labeled trees with n nodes: (2*n-3)!/(n-1)! for n >= 2, a(1) = 1.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =20a(4) =210a(5) =3024a(6) =55440a(7) =1235520a(8) =32432400a(9) =980179200a(10) =33522128640

External references