Number of labeled planar trees with n nodes such that the root is smaller than all its children.

A071213

Number of labeled planar trees with n nodes such that the root is smaller than all its children.

Terms

    a(0) =1a(1) =4a(2) =34a(3) =436a(4) =7428a(5) =157368a(6) =3980688a(7) =116949600a(8) =3911421600a(9) =146673662400

External references