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A006397 Number of planar maps without faces or vertices of degree 1.
(Formerly M1236)
0
1, 2, 4, 10, 34, 114, 475 (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: A154219 A173489 A089476 * A003422 A117402 A109455

Adjacent sequences:  A006394 A006395 A006396 * A006398 A006399 A006400

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 06:52 EST 2012. Contains 205694 sequences.