Number of tree-rooted toroidal maps with 3 faces and n vertices and without isthmuses.

A006437

Number of tree-rooted toroidal maps with 3 faces and n vertices and without isthmuses.

Terms

    a(0) =70a(1) =2330a(2) =32130a(3) =271285a(4) =1655800a(5) =7997850a(6) =32332170a(7) =113568455a(8) =355905030

External references