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A006406 Number of 2-connected planar maps (see reference for precise definition).
(Formerly M1195)
0
1, 1, 2, 4, 9, 24, 81, 274 (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: A135934 A137154 A098448 * A097656 A012936 A013091

Adjacent sequences:  A006403 A006404 A006405 * A006407 A006408 A006409

KEYWORD

nonn,more

AUTHOR

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

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.