Number of rooted toroidal maps with 2 vertices and n faces and no isthmuses.
A006425
Number of rooted toroidal maps with 2 vertices and n faces and no isthmuses.
Terms
- a(0) =4a(1) =79a(2) =900a(3) =7885a(4) =59080a(5) =398846a(6) =2499096a(7) =14805705a(8) =83969600a(9) =459868530a(10) =2447439384a(11) =12718070274a(12) =64766697520a(13) =324156347260
External references
- oeis: A006425