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A006389 Number of planar maps without faces of degree 1.
(Formerly M1632)
+0
1
1, 2, 6, 18, 68, 313, 1592 (list; graph; listen)
OFFSET

1,2

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: A150080 A150081 A006674 this_sequence A030269 A150082 A060181

Adjacent sequences: A006386 A006387 A006388 this_sequence A006390 A006391 A006392

KEYWORD

nonn

AUTHOR

njas

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.


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