%I #8 Feb 10 2019 17:17:21
%S 0,0,0,1,6,27,132,644,3165
%N Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).
%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.
%Y Cf. A003104, A323923-A323930.
%K nonn,more
%O 1,5
%A _N. J. A. Sloane_, Feb 09 2019