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A030532 Number of polyhexes of class PF2. 9
0, 1, 6, 35, 168, 807, 3738, 17326, 79909, 369366, 1709123, 7929590, 36880231 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,3

COMMENTS

See reference for precise definition.

REFERENCES

S. J. Cyvin et al., Enumeration and classification of benzenoid systems 32. Normal perifusenes with two internal vertices, J. Chem. Inform. Comput. Sci., 32 (1992), 532-540.

LINKS

Table of n, a(n) for n=4..16.

CROSSREFS

Cf. A026106, A026118, A026298, A030519, A030520, A030525, A030529, A030532, A030534.

Sequence in context: A203288 A026957 A026987 * A026997 A014337 A002041

Adjacent sequences:  A030529 A030530 A030531 * A030533 A030534 A030535

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 23 12:00 EDT 2019. Contains 326222 sequences. (Running on oeis4.)