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A006395 Number of unsensed connected planar maps with n nodes and without loops or parallel edges.
(Formerly M2494)
0
1, 1, 3, 5, 14, 42, 150, 624, 2947, 15079, 82607, 474030 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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

Sequence in context: A284415 A318227 A230585 * A078718 A081393 A338368

Adjacent sequences:  A006392 A006393 A006394 * A006396 A006397 A006398

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(9)-a(12) from Sean A. Irvine, Mar 30 2017

STATUS

approved

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Last modified January 23 16:17 EST 2021. Contains 340385 sequences. (Running on oeis4.)