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A006423 Number of rooted toroidal maps.
(Formerly M4748)
0
10, 240, 2246, 12656, 52164, 173776, 495820, 1256992, 2902702 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

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

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

LINKS

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

CROSSREFS

Sequence in context: A177595 A013922 A215835 * A067423 A221099 A171204

Adjacent sequences:  A006420 A006421 A006422 * A006424 A006425 A006426

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 13 06:22 EDT 2020. Contains 336442 sequences. (Running on oeis4.)