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A006392 Number of planar maps without faces of degree 1 or 2.
(Formerly M3368)
+0
1
1, 4, 9, 34, 161, 830 (list; graph; listen)
OFFSET

2,2

REFERENCES

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: A048757 A054433 A096531 this_sequence A084449 A134815 A120073

Adjacent sequences: A006389 A006390 A006391 this_sequence A006393 A006394 A006395

KEYWORD

nonn

AUTHOR

njas

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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