A323929 Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).

0, 0, 1, 1, 7, 30, 141, 671, 3284, 15998, 78505, 385766, 2214783, 9382168

Offset

1,5

References

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.

Links

Table of n, a(n) for n=1..14.

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-A323930, A256981.

Sequence in context: A297080 A375308 A256981 * A180786 A343755 A026653

Adjacent sequences: A323926 A323927 A323928 * A323930 A323931 A323932

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 09 2019

Extensions

a(10)-a(14) from Trinajstić et al. (Table 4.11, the number of non-Kekuléan polyhexes with h hexagons) added by Andrey Zabolotskiy, Feb 08 2023

Status

approved