Number of rooted toroidal maps with 4 vertices and n faces and no isthmuses.

A006427

Number of rooted toroidal maps with 4 vertices and n faces and no isthmuses.

Terms

    a(0) =20a(1) =1071a(2) =26320a(3) =431739a(4) =5494896a(5) =58677420a(6) =550712668a(7) =4681144391a(8) =36786186216a(9) =271221867098

External references