A323851 - OEIS

%I #14 Feb 16 2023 14:59:21

%S 0,0,0,1,2,12,51,229,969,4098,16867,68925,278907,1123302,4507640

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

%D 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.

%H A. T. Balaban, J. Brunvoll, B. N. Cyvin & S. J. Cyvin, <a href="https://doi.org/10.1016/S0040-4020(01)85110-3">Enumeration of branched catacondensed benzenoid hydrocarbons and their numbers of Kekulé structures</a> Tetrahedron, 44(1) (1988), 221-228. See Table 1.

%H Wenchen He and Wenjie He, <a href="https://doi.org/10.1016/S0040-4020(01)82078-0">Generation and enumeration of planar polycyclic aromatic hydrocarbons</a>, Tetrahedron 42.19 (1986): 5291-5299. See Table 1, column C.

%Y Cf. A003104, A323924-A323930.

%K nonn,more

%O 1,5

%A _N. J. A. Sloane_, Feb 09 2019

%E 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