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A006437 Tree-rooted toroidal maps.
(Formerly M5342)
0
70, 2330, 32130, 271285, 1655800, 7997850, 32332170, 113568455, 355905030 (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: A093757 A163022 A271031 * A067643 A285170 A017786

Adjacent sequences:  A006434 A006435 A006436 * A006438 A006439 A006440

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 24 02:51 EDT 2019. Contains 325287 sequences. (Running on oeis4.)