

A006421


Number of rooted planar maps with 4 vertices and n faces.
(Formerly M5211)


0



1, 30, 449, 4795, 41850, 319320, 2213665, 14283280, 87169790, 508887860, 2865204762, 15654301865
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OFFSET

2,2


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=2..13.
T. R. S. Walsh, A. B. Lehman, Counting rooted maps by genus. III: Nonseparable maps, J. Combinatorial Theory Ser. B 18 (1975), 222259.


CROSSREFS

Sequence in context: A280856 A281602 A307917 * A035710 A042746 A281700
Adjacent sequences: A006418 A006419 A006420 * A006422 A006423 A006424


KEYWORD

nonn


AUTHOR

N. J. A. Sloane.


EXTENSIONS

a(13) and title improved by Sean A. Irvine, Apr 06 2017


STATUS

approved



