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A054936
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Number of achiral planar maps on n nodes up to orientation-preserving isomorphisms.
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1
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2, 4, 14, 47, 184, 761, 3314, 14997, 69886, 333884, 1626998, 8067786, 40580084, 206734083, 1064666724, 5536480877, 29036188788
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Likely the same as A006443. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 13 2008]
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LINKS
| V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.
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FORMULA
| a(n) = 2*A006385(n)-A006384(n). [Liskovets eq 3a] - R. J. Mathar, Oct 01 2011
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CROSSREFS
| Sequence in context: A149852 A005437 A062868 * A006443 A152103 A102879
Adjacent sequences: A054933 A054934 A054935 * A054937 A054938 A054939
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KEYWORD
| nonn,easy,more
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 24 2000
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