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A006391 Number of planar maps without loops.
(Formerly M1464)
0
1, 2, 5, 14, 45, 191, 871 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

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: A174300 A059216 A007823 * A149895 A149896 A149897

Adjacent sequences:  A006388 A006389 A006390 * A006392 A006393 A006394

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 20:26 EST 2012. Contains 205852 sequences.