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A026106
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Number of polyhexes of class PF2.
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9
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2, 5, 16, 55, 208, 817, 3336, 13935, 59406, 257079, 1126948, 4992421
(list; graph; refs; listen; history; internal format)
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OFFSET
| 5,1
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COMMENTS
| See reference for precise definition.
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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.
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CROSSREFS
| Cf. A026106, A026118, A026298, A030519, A030520, A030525, A030529, A030532, A030534.
Sequence in context: A149971 A176828 A149972 * A066642 A019988 A137732
Adjacent sequences: A026103 A026104 A026105 * A026107 A026108 A026109
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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