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A038141 Number of planar polyhexes with n cells with at least two holes, all holes having size at least two. 2

%I #15 Dec 17 2022 12:43:41

%S 0,0,0,0,0,0,0,0,0,0,0,0,1,11,149,1618,15123,125764

%N Number of planar polyhexes with n cells with at least two holes, all holes having size at least two.

%C Planar, proper multiple coronoid systems enumerated by area. Free systems are enumerated, i.e., translations, rotations and reflections are regarded as the same configuration.

%C The last term includes 4 polyhexes with three holes.

%D S. J. Cyvin, J. Brunvoll, R. S. Chen, B. N. Cyvin, F. J. Zhang, Theory of Coronoid Hydrocarbons II, Lecture Notes in Chemistry 62, Springer-Verlag, 1994. (see table 3.2, p. 66)

%H J. V. Knop et al., <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.

%Y Cf. A000228 (hexagonal free polyominoes), A038140 (planar single coronoids).

%K nonn,more

%O 1,14

%A _N. J. A. Sloane_.

%E Edited by Markus Voege (markus.voege(AT)inria.fr), Dec 03 2003

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