A006440 Number of tree-rooted toroidal maps with 3 faces and n vertices and without separating loops. (Formerly M4756)

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

Offset

1,1

References

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

Links

Table of n, a(n) for n=1..9.

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.

Sequence in context: A233170 A211913 A347845 * A054944 A272854 A015093

Adjacent sequences: A006437 A006438 A006439 * A006441 A006442 A006443

Keyword

nonn,more

Author

N. J. A. Sloane

Extensions

Name clarified by Andrew Howroyd, Apr 04 2021

Status

approved