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A006401 Number of connected planar maps without vertices of degree 1.
(Formerly M1384)
0
1, 1, 2, 5, 10, 28, 86, 285, 1055, 4211 (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).
LINKS
Timothy R. Walsh, Generating nonisomorphic maps without storing them, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.
CROSSREFS
Sequence in context: A257889 A363388 A287963 * A283460 A102964 A075885
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(11)-a(12) from Sean A. Irvine, Mar 31 2017
STATUS
approved

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Last modified April 19 02:28 EDT 2024. Contains 371782 sequences. (Running on oeis4.)