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A108071
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Number of self-dual planar polyhexes with n hexagons.
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2
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1, 1, 2, 4, 8, 21, 53, 151, 458, 1477, 4918, 16956, 59494, 212364, 766753, 2796876, 10284793, 38096072, 141998218, 532301941, 2005638293, 7592441954, 28865031086, 110174528925, 422064799013, 1622379252093
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| Gunnar Brinkmann, Gilles Caporossi and Pierre Hansen, A constructive enumeration of fusenes and benzenoids, Journal of Algorithms 45 (2002), pp. 155-166.
Gunnar Brinkmann, Gilles Caporossi and Pierre Hansen, A survey and new results on computer enumeration of polyhex and fusene hydrocarbons, J. Chem. Inf. Comput. Sci., 43 (2003), 842-851.
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CROSSREFS
| Cf. A018190, A108070, A108072.
Sequence in context: A001315 A002040 A162110 * A055876 A065847 A133604
Adjacent sequences: A108068 A108069 A108070 * A108072 A108073 A108074
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KEYWORD
| nonn
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AUTHOR
| Gunnar Brinkmann (Gunnar.Brinkmann(AT)ugent.be), Jun 05 2005
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