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A323930 Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986). 7
1, 1, 3, 7, 22, 81, 331, 1436, 6510 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..9.

Wenchen He and Wenjie He, Generation and enumeration of planar polycyclic aromatic hydrocarbons, Tetrahedron 42.19 (1986): 5291-5299. See Table 1.

CROSSREFS

Cf. A003104, A323923-A323929.

A018190 is a very similar sequence with (as He and He remark) a slightly different definition.

Sequence in context: A111772 A233005 A018190 * A187982 A000228 A108070

Adjacent sequences:  A323927 A323928 A323929 * A323931 A323932 A323933

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Feb 09 2019

STATUS

approved

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Last modified August 3 13:59 EDT 2021. Contains 346438 sequences. (Running on oeis4.)