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A006388 Number of planar maps with n edges and without faces of degree 1.
(Formerly M1633)
0
1, 2, 6, 18, 74, 393, 2282, 14700, 99614, 703519, 5123598, 38279496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..12.

Timothy R. Walsh, Generating nonisomorphic maps without storing them, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178.

CROSSREFS

Cf. A006384.

Sequence in context: A004395 A277862 A213427 * A007116 A280763 A079391

Adjacent sequences:  A006385 A006386 A006387 * A006389 A006390 A006391

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(8)-a(12) from Sean A. Irvine, Mar 28 2017

STATUS

approved

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Last modified March 5 13:55 EST 2021. Contains 341823 sequences. (Running on oeis4.)