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A006445 Number of n-edge 3-connected planar maps with a sense-reversing automorphism.
(Formerly M0172)
+0
1
0, 0, 0, 0, 0, 1, 0, 1, 2, 1, 4, 9, 12, 27, 50, 99, 188, 386, 740, 1528, 3012, 6192, 12376, 25594, 51628, 107135, 218100, 453895, 930812, 1943281, 4009512, 8394915, 17414512 (list; graph; listen)
OFFSET

1,9

COMMENT

Maps are counted up to isomorphism which is not restricted to those that preserve the orientation of the sphere.

REFERENCES

Computed by Nick Wormald (unpublished).

CROSSREFS

Sequence in context: A077160 A057046 A015943 this_sequence A097949 A117338 A137634

Adjacent sequences: A006442 A006443 A006444 this_sequence A006446 A006447 A006448

KEYWORD

nonn

AUTHOR

njas, T. R. S. Walsh, personal communication

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.


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