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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
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: A361774 A294826 A247115 * A264711 A279325 A158104
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
Name clarified by Andrew Howroyd, Apr 04 2021
STATUS
approved

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Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)