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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 (list; graph; refs; listen; history; text; internal format)
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.

LINKS

Table of n, a(n) for n=30..42.

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 A010003

Adjacent sequences:  A121961 A121962 A121963 * A121965 A121966 A121967

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Sep 10 2006

STATUS

approved

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Last modified November 14 02:19 EST 2019. Contains 329108 sequences. (Running on oeis4.)