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A006387 Genus 1 maps with n edges.
(Formerly M4237)
0
1, 6, 40, 320, 2946 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Walsh, T. R. S.; Generating nonisomorphic maps without storing them. SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

CROSSREFS

Sequence in context: A138240 A083805 A181571 * A014481 A184266 A000683

Adjacent sequences:  A006384 A006385 A006386 * A006388 A006389 A006390

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 05:55 EST 2012. Contains 205860 sequences.