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A030525 Number of polyhexes of class PF2 with a particular symmetry. 10
0, 1, 2, 5, 10, 21, 41, 85, 167, 345, 680, 1421, 2823, 5953, 11902, 25341, 50993, 109409, 221372, 478189, 972346, 2112181, 4313451, 9415165, 19301199, 42303241, 87015978, 191398741, 394888368, 871297141, 1802488991, 3987998101, 8270169571, 18342194721 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,3

COMMENTS

See reference for precise definition.

Cyvin has incorrect a(13)=273 and a(14)=608 in Table III due to using incorrect values for A026298(13) and A026298(14) in Table II. - Sean A. Irvine, Apr 03 2020

LINKS

Table of n, a(n) for n=4..37.

S. J. Cyvin, Zhang Fuji, B. N. Cyvin, Guo Xiaofeng, and J. Brunvoll, Enumeration and classification of benzenoid systems. 32. Normal perifusenes with two internal vertices, J. Chem. Inform. Comput. Sci., 32 (1992), 532-540.

CROSSREFS

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

Sequence in context: A212531 A261681 A333798 * A116385 A267515 A215411

Adjacent sequences:  A030522 A030523 A030524 * A030526 A030527 A030528

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(13) and a(14) corrected and more terms from Sean A. Irvine, Apr 03 2020

STATUS

approved

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Last modified October 20 09:24 EDT 2021. Contains 348100 sequences. (Running on oeis4.)