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A006399 Number of unsensed planar maps with n edges and without loops or isthmuses.
(Formerly M1162)
0
1, 2, 4, 8, 27, 76, 295, 1188, 5462, 26580, 138110 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,2
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
CROSSREFS
Sequence in context: A112285 A037170 A212409 * A326293 A324328 A056800
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(9)-a(12) from Sean A. Irvine, Mar 29 2017
STATUS
approved

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Last modified April 14 18:28 EDT 2024. Contains 371667 sequences. (Running on oeis4.)