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A006407 Number of 2-connected planar maps.
(Formerly M1157)
0
1, 1, 2, 4, 8, 20, 58, 177 (list; graph; refs; listen; history; internal format)
OFFSET

3,3

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: A082279 A113180 A000116 * A100447 A112278 A059731

Adjacent sequences:  A006404 A006405 A006406 * A006408 A006409 A006410

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 08:44 EST 2012. Contains 205998 sequences.