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A030525 Number of polyhexes of class PF2. 9
0, 1, 2, 5, 10, 21, 41, 85, 167, 273, 608, 1421, 2823 (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: A191531 A212531 A261681 * A116385 A267515 A215411

Adjacent sequences:  A030522 A030523 A030524 * A030526 A030527 A030528

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 23 14:06 EDT 2018. Contains 316528 sequences. (Running on oeis4.)