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A323930
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Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).
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8
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1, 1, 3, 7, 22, 81, 331, 1436, 6510, 30129, 141512, 671538, 3210620, 15443871, 74662005, 362506902
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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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. [incorrectly gives a(12) = 671512 in Table 4.13]
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LINKS
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FORMULA
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CROSSREFS
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A018190 is a very similar sequence with (as He and He remark) a slightly different definition. Cf. A000228, A038147.
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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a(10)-a(16) from Cyvin, Brunvoll & Cyvin (Table 1) added by Andrey Zabolotskiy, Feb 08 2023
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STATUS
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approved
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