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A026298 Number of polyhexes of class PF2. 9
4, 28, 176, 950, 4908, 24402, 119204, 575312, 2757460, 13157752 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,1

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=7..16.

CROSSREFS

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

Sequence in context: A272791 A291918 A223166 * A181895 A264707 A216211

Adjacent sequences:  A026295 A026296 A026297 * A026299 A026300 A026301

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 20 10:56 EST 2018. Contains 299385 sequences. (Running on oeis4.)