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A006393 Number of unsensed planar maps with n edges and without faces of degree 1 or 2.
(Formerly M3367)
0
1, 4, 9, 32, 132, 597, 3064, 17114, 102274, 643907, 4219540 (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

Table of n, a(n) for n=2..12.

CROSSREFS

Sequence in context: A057819 A129196 A119574 * A320920 A048757 A173659

Adjacent sequences:  A006390 A006391 A006392 * A006394 A006395 A006396

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(8)-a(12) from Sean A. Irvine, Mar 29 2017

STATUS

approved

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Last modified January 22 23:00 EST 2019. Contains 319365 sequences. (Running on oeis4.)