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A121286 Number of catacondensed hexagonal systems with n hexagons. 0
1, 3, 9, 26, 72, 192, 496, 1248, 3072, 7424, 17664, 41472, 96256, 221184, 503808, 1130496, 2555904, 5701632 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This is the erroneous version published by Tosic et al. The correct sequence is in A072863. - R. J. Mathar, May 21 2018

LINKS

Table of n, a(n) for n=1..18.

Tosic R., Masulovic D., Stojmenovic I., Brunvoll J., Cyvin B. N. and Cyvin S. J., Enumeration of polyhex hydrocarbons to h = 17, J. Chem. Inf. Comput. Sci., 1995, 35, 181-187 Table 1 with an error at h=16.

CROSSREFS

Sequence in context: A291410 A048470 A138237 * A072863 A054963 A291733

Adjacent sequences:  A121283 A121284 A121285 * A121287 A121288 A121289

KEYWORD

nonn,dead

AUTHOR

Parthasarathy Nambi, Sep 06 2006

STATUS

approved

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Last modified May 15 22:33 EDT 2021. Contains 343937 sequences. (Running on oeis4.)