login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 (list; graph; refs; listen; history; text; internal format)
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
J. V. Knop et al., Use of small computers for large computations: enumeration of polyhex hydrocarbons, J. Chem. Inf. Comput. Sci., 30 (1990), 159-160.
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 22 21:30 EST 2024. Contains 370265 sequences. (Running on oeis4.)