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%I #12 Feb 16 2023 14:45:48
%S 1,3,15,62,312,1435,6785
%N Number of catacondensed coronoid systems with n hexagons with a single hole.
%H S. J. Cyvin et al., <a href="https://doi.org/10.1007/BF00673438">The simplest coronoids: hollow hexagons</a>, Struct. Chem., 2 (1991), 555-566.
%Y Cf. A038140.
%K nonn,more
%O 8,2
%A _N. J. A. Sloane_, Sep 23 2006
%E Name clarified by _Andrey Zabolotskiy_, Feb 16 2023
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