Number of tree-rooted toroidal maps with 2 faces and n vertices and without separating loops.

A006439

Number of tree-rooted toroidal maps with 2 faces and n vertices and without separating loops.

Terms

    a(0) =4a(1) =152a(2) =2630a(3) =31500a(4) =303534a(5) =2530976a(6) =19030428a(7) =132386340a(8) =866782510a(9) =5405853200

External references