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A122539
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Number of benzenoids with 21 hexagons with D_(2h) symmetry and 60+2n carbons.
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31
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1, 3, 5, 8, 12, 16, 16, 42, 31, 43, 45, 73, 30, 40
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OFFSET
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60,2
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COMMENTS
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The total number of carbons in 21 free hexagons is 6*21=126, but since they have to be attached (form overlapping molecules sharing edges) the sequence ends already at compounds with 86 carbons. - R. J. Mathar, May 02 2008
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REFERENCES
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G. Brinkmann, G. Caporossi and P. Hansen, "A survey and new results on computer enumeration of polyhex and fusene hydrocarbons", J. Chem. Inf. Comput. Sci., vol. 43 (2003) pp. 842-851. See Table 4 column 5 on page 846.
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LINKS
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Table of n, a(n) for n=60..73.
G. Brinkmann, G. Caporossi and P. Hansen, A survey and new results on computer enumeration of polyhex and fusene hdyrocarbons, J Chem. Inf Comput. Sci vol 43 no 3 (2003) pp 842-851.
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EXAMPLE
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If n=70 then the number of benzenoids with 21 hexagons with D_(2h) symmetry is 16.
If n=86 then the number of benzenoids with 21 hexagons with D_(2h) symmetry is 40.
Starting value of n is 60 and is even.
For n=10, there are 16 different forms of C_70H_30 of benzenoids of 21 hexagons attached along at least one edge, which each have D_(2h) planar symmetry.
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CROSSREFS
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Sequence in context: A114891 A218485 A045716 * A023660 A161339 A023562
Adjacent sequences: A122536 A122537 A122538 * A122540 A122541 A122542
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KEYWORD
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nonn,fini,full
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AUTHOR
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Parthasarathy Nambi, Sep 18 2006
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EXTENSIONS
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Edited by R. J. Mathar, May 02 2008
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STATUS
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approved
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