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A006400 Number of connected planar maps without vertices of degree 1.
(Formerly M1404)
+0
1
1, 1, 2, 5, 11, 33, 117, 431 (list; graph; listen)
OFFSET

3,3

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: A079571 A056364 A056365 this_sequence A080068 A101834 A117758

Adjacent sequences: A006397 A006398 A006399 this_sequence A006401 A006402 A006403

KEYWORD

nonn,more

AUTHOR

njas

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.


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