%I #18 Feb 17 2023 17:39:15

%S 0,0,0,0,0,0,0,1,5,43,283,1954,12363,76283,453946,2641506

%N Number of planar polyhexes with n cells and a single hole of size at least 2.

%H Sven J. Cyvin, Jon Brunvoll, Björg N. Cyvin, John L. Bergan, and E. Brendsdal, <a href="https://doi.org/10.1007/BF00673438">The simplest coronoids: hollow hexagons</a>, Struct. Chem., 2 (1991), 555-566.

%H J. V. Knop, W. R. Mueller, K. Szymanski, and N. Trinajstic, <a href="https://doi.org/10.1021/ci00066a010">Use of small computers for large computations: enumeration of polyhex hydrocarbons</a>, J. Chem. Inf. Comput. Sci., 30 (1990), 159-160.

%Y Cf. A018190, A038141, A323930, A038144.

%K nonn,more

%O 1,9

%A _N. J. A. Sloane_

%E Name clarified by _Andrey Zabolotskiy_, Feb 17 2023