A006436 Number of tree-rooted toroidal maps with 2 faces and n vertices and without isthmuses.

10, 192, 1630, 8924, 36834, 124560, 362934, 941820, 2227368, 4881448, 889015725

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. A006437.

Extensions

Name clarified by Andrew Howroyd, Apr 04 2021