id:A006445 - OEIS Search Results

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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	REFERENCES	`Computed by Nick Wormald (unpublished).`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.

AT&T Labs Research