A006440 Number of tree-rooted toroidal maps with 3 faces and n vertices and without separating loops.

10, 805, 23730, 431319, 5862920, 65548890, 636520890, 5555779185, 44603489700

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• more

References

• N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

• T. R. S. Walsh and A. B. Lehman, Counting rooted maps by genus. III: Nonseparable maps, J. Combinatorial Theory Ser. B 18 (1975), 222-259.

Crossrefs

Cf. A006439.

Extensions

Name clarified by Andrew Howroyd, Apr 04 2021