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Search: id:A006445
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| A006445 |
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Number of n-edge 3-connected planar maps with a sense-reversing automorphism.
(Formerly M0172)
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+0
1
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| 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)
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OFFSET
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1,9
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COMMENT
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Maps are counted up to isomorphism which is not restricted to those that preserve the orientation of the sphere.
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Computed by Nick Wormald (unpublished).
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CROSSREFS
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Sequence in context: A057046 A163547 A015943 this_sequence A097949 A117338 A137634
Adjacent sequences: A006442 A006443 A006444 this_sequence A006446 A006447 A006448
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), T. R. S. Walsh, personal communication
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