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A038143 Hexagonal cata-condensed helicenes with n cells (non-planar cata-fused benzenoid hydrocarbons). 5
0, 0, 0, 0, 0, 1, 5, 35, 200, 1121, 5919, 30509, 153187, 756825, 3688195 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
J. V. Knop, K. Szymanski, Ž. Jeričević, and N. Trinajstić, On the total number of polyhexes, Match, No. 16 (1984), 119-134.
CROSSREFS
Equals A002216-A038142. Cf. A018190.
Sequence in context: A241779 A265976 A123008 * A352404 A356391 A221578
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(12)-a(15) from Andrey Zabolotskiy, Feb 16 2023
STATUS
approved

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Last modified April 24 04:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)