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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
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 11, 149, 1618, 15123, 125764
OFFSET
1,14
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.
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)
LINKS
CROSSREFS
Cf. A018190.
Cf. A000228 (hexagonal free polyominoes), A038140 (planar single coronoids).
Sequence in context: A261536 A175635 A103544 * A307072 A142083 A205085
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
Edited by Markus Voege (markus.voege(AT)inria.fr), Dec 03 2003
STATUS
approved