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A323851
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Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).
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3
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0, 0, 0, 1, 2, 12, 51, 229, 969, 4098, 16867, 68925, 278907, 1123302, 4507640
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OFFSET
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1,5
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REFERENCES
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N. Trinajstić, S. Nikolić, J. V. Knop, W. R. Müller and K. Szymanski, Computational Chemical Graph Theory: Characterization, Enumeration, and Generation of Chemical Structures by Computer Methods, Ellis Horwood, 1991.
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LINKS
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Table of n, a(n) for n=1..15.
A. T. Balaban, J. Brunvoll, B. N. Cyvin & S. J. Cyvin, Enumeration of branched catacondensed benzenoid hydrocarbons and their numbers of Kekulé structures Tetrahedron, 44(1) (1988), 221-228. See Table 1.
Wenchen He and Wenjie He, Generation and enumeration of planar polycyclic aromatic hydrocarbons, Tetrahedron 42.19 (1986): 5291-5299. See Table 1, column C.
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CROSSREFS
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Cf. A003104, A323924-A323930.
Sequence in context: A012382 A198008 A359523 * A054667 A009537 A057547
Adjacent sequences: A323848 A323849 A323850 * A323852 A323853 A323854
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Feb 09 2019
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EXTENSIONS
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a(13)-a(15) from Trinajstić et al. (Table 4.2, the number of cata-condensed benzenoids with h hexagons, branched) added by Andrey Zabolotskiy, Feb 08 2023
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STATUS
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approved
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