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A006405 Number of 2-connected maps without faces of degree 2.
(Formerly M1365)
0
1, 1, 2, 5, 9, 24, 70, 222 (list; graph; refs; listen; history; text; 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.

LINKS

Table of n, a(n) for n=3..10.

CROSSREFS

Sequence in context: A109621 A075200 A075198 * A136108 A026297 A109742

Adjacent sequences:  A006402 A006403 A006404 * A006406 A006407 A006408

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 18 09:19 EDT 2013. Contains 225419 sequences.