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A038141
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Number of planar polyhexes with n cells with at least two holes, all holes having size at least two.
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1
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 11, 149, 1618, 15123, 125764
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,14
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COMMENTS
| Planar, proper multiple coronoid systems enumerated by area. Free systems are enumerated, i.e. translations, rotations and reflections are regarded as the same configuration.
The last term includes 4 polyhexes with three holes.
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REFERENCES
| 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)
J. V. Knop et al., Use of small computers for large computations..., J. Chem. Inf. Comput Sci., 30 (1990), 159-160.
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CROSSREFS
| Cf. A018190.
Cf. A000228 (hexagonal free polyominoes), A038140 (planar single coronoids).
Sequence in context: A194726 A175635 A103544 * A142083 A205085 A068646
Adjacent sequences: A038138 A038139 A038140 * A038142 A038143 A038144
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Edited by Markus Voege (markus.voege(AT)inria.fr), Dec 03 2003
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