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2020.
Computing Degeneracies of the Most Important Structures of Polycyclic Aromatic Hydrocarbons
: We construct bijections between certain energetically favorable resonance-like structures in several classes of benzenoid compounds and some well- known combinatorial structures enumerated by Catalan and related numbers. In that way we derive explicit formulas for the n umber of such structures in the considered classes of compounds. We also list some open problems and indicate some possible d irections for future research.