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A006392 Number of planar maps with n edges and without faces of degree 1 or 2.
(Formerly M3368)
0
1, 4, 9, 34, 161, 830, 4779, 29092, 184510, 1208178, 8116922 (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: A149134 A149135 A149136 * A179079 A084449 A182144

Adjacent sequences:  A006389 A006390 A006391 * A006393 A006394 A006395

KEYWORD

nonn

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 07:31 EST 2022. Contains 350481 sequences. (Running on oeis4.)