Number of tree-rooted toroidal maps with 2 faces and n vertices and without separating loops or isthmuses.
A006434
Number of tree-rooted toroidal maps with 2 faces and n vertices and without separating loops or isthmuses.
Terms
- a(0) =4a(1) =120a(2) =1230a(3) =7424a(4) =32424a(5) =113584a(6) =338742a(7) =893220a(8) =2136618a(9) =4721728a(10) =9770904
External references
- oeis: A006434