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A006424 Number of rooted toroidal maps.
(Formerly M5104)
0
20, 831, 12656, 109075, 648792, 2978245, 11293436, 36973989 (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..8.

CROSSREFS

Sequence in context: A041760 A250550 A117798 * A192370 A113102 A250017

Adjacent sequences:  A006421 A006422 A006423 * A006425 A006426 A006427

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified December 20 23:03 EST 2014. Contains 252290 sequences.