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A038144 Number of planar n-hexes, or polyhexes (in the sense of A000228, so rotations and reflections count as the same shape) with at least one hole. 5
0, 0, 0, 0, 0, 1, 2, 13, 67, 404, 2323, 13517, 76570, 429320, 2373965, 13004323, 70641985, 381260615, 2046521491, 10936624026, 58228136539 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
COMMENTS
Apparently the same as the number of hexagonal planar circulenes (planar rings of hexagons) with n cells, although the two sequences may in fact differ for large n.
REFERENCES
J. V. Knop et al., On the total number of polyhexes, Match, No. 16 (1984), 119-134.
LINKS
J. V. Knop, K. Szymanski, Ž. Jeričević, and N. Trinajstić, On the total number of polyhexes, Match, No. 16 (1984), 119-134.
CROSSREFS
Sequence in context: A045764 A106999 A054566 * A097977 A136780 A301944
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Joseph Myers, May 05 2002
Further terms from Joseph Myers, Nov 06 2003
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007
Link edited by Joseph Myers, Nov 17 2010
STATUS
approved

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)