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A006437
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Number of tree-rooted toroidal maps with 3 faces and n vertices and without isthmuses.
(Formerly M5342)
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1
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OFFSET
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1,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=1..9.
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.
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CROSSREFS
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Cf. A006436.
Sequence in context: A093757 A163022 A271031 * A067643 A285170 A017786
Adjacent sequences: A006434 A006435 A006436 * A006438 A006439 A006440
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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Name clarified by Andrew Howroyd, Apr 04 2021
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STATUS
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approved
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