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A030519 Number of polyhexes of class PF2. 9
2, 13, 101, 619, 3641, 20028, 106812, 554352, 2828660 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,1

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=8..16.

CROSSREFS

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

Sequence in context: A064325 A123619 A187746 * A141116 A234299 A301355

Adjacent sequences:  A030516 A030517 A030518 * A030520 A030521 A030522

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 15 10:15 EDT 2019. Contains 328026 sequences. (Running on oeis4.)