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%I #12 Dec 17 2022 12:43:56
%S 1,1,3,2,11,12,40,68,192,395,1061,2432,6318,15417,39660,99550,256388,
%T 654003,1689973,4355457,11305165,29347706,76527893
%N Number of primitive coronoid systems with n hexagons.
%H S. J. Cyvin et al., <a href="http://dx.doi.org/10.1007/BF00673438">The simplest coronoids: hollow hexagons</a>, Struct. Chem., 2 (1991), 555-566.
%H Johan Nilsson, <a href="/A122672/a122672.pdf">Illustrations for initial terms</a>
%K nonn,more
%O 8,3
%A _N. J. A. Sloane_, Sep 23 2006
%E a(15)-a(30) from _Johan Nilsson_, Aug 12 2015
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