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A006439 Number of tree-rooted toroidal maps with 2 faces and n vertices and without separating loops.
(Formerly M3719)
2
4, 152, 2630, 31500, 303534, 2530976, 19030428, 132386340, 866782510, 5405853200 (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).

LINKS

Table of n, a(n) for n=1..10.

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. A006440.

Sequence in context: A226073 A294826 A247115 * A264711 A279325 A158104

Adjacent sequences:  A006436 A006437 A006438 * A006440 A006441 A006442

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

Name clarified by Andrew Howroyd, Apr 04 2021

STATUS

approved

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Last modified November 27 01:16 EST 2021. Contains 349344 sequences. (Running on oeis4.)