A323926 Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).

1, 1, 2, 6, 15, 51, 190, 765, 3226, 14131, 63007, 285772, 995837, 6061703

Offset

1,3

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, A256982.

Sequence in context: A196961 A368411 A255540 * A256982 A372853 A047870

Adjacent sequences: A323923 A323924 A323925 * A323927 A323928 A323929

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 09 2019

Extensions

a(10)-a(14) from Trinajstić et al. (Table 4.6, the number of Kekuléan polyhexes with h hexagons) added by Andrey Zabolotskiy, Feb 08 2023

Status

approved