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A006425
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Number of rooted toroidal maps with 2 vertices and n faces and no isthmuses.
(Formerly M3700)
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1
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4, 79, 900, 7885, 59080, 398846, 2499096, 14805705, 83969600, 459868530, 2447439384, 12718070274, 64766697520, 324156347260, 1598200903280, 7776728909121, 37404399901296, 178060831286890, 839857764202520, 3928581810398630, 18239060530882224, 84101317494787684
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Name clarified and terms a(11) and beyond from Andrew Howroyd, Apr 05 2021
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STATUS
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approved
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