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A108072
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Number of self-dual planar polyhexes with n hexagons and having nontrivial symmetry.
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2
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1, 0, 0, 0, 0, 5, 22, 90, 342, 1247, 4491, 16095, 57906, 209170, 760830, 2784913, 10262649, 38051063, 141914613, 532131882, 2005320952, 7591794561, 28863820538, 110172051829, 422060152511, 1622369728951
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OFFSET
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1,6
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LINKS
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Table of n, a(n) for n=1..26.
Gunnar Brinkmann, Gilles Caporossi and Pierre Hansen, A constructive enumeration of fusenes and benzenoids, Journal of Algorithms, Volume 45, Issue 2, November 2002, Pages 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. 2003, 43, 3, 842-851.
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CROSSREFS
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Cf. A018190, A108070, A108071.
Sequence in context: A262293 A086090 A037529 * A081892 A128566 A097138
Adjacent sequences: A108069 A108070 A108071 * A108073 A108074 A108075
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KEYWORD
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nonn
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AUTHOR
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Gunnar Brinkmann, Jun 05 2005
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STATUS
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approved
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