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A121964
Number of benzenoids with 21 hexagons, C_(2h) symmetry and containing 2n carbon atoms.
31
1, 13, 45, 188, 587, 1588, 4547, 11377, 24111, 47515, 85645, 124260, 117943
OFFSET
30,2
COMMENTS
See Table 4 column 6 of Brinkmann et al. paper.
REFERENCES
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.
EXAMPLE
If n=30 then the number of benzenoids with 21 hexagons with C_(2h) symmetry is 1 which is the first term in the sequence.
CROSSREFS
Sequence in context: A048364 A254675 A141549 * A147208 A281315 A361622
KEYWORD
nonn
AUTHOR
Parthasarathy Nambi, Sep 10 2006
STATUS
approved