OFFSET
1,7
COMMENTS
This sequence counts fusenes which stay the same when flipped over. Fusenes are like polyhexes with additional criteria that no holes are allowed, but on the other hand, helicene-like self-touching or self-overlapping configurations are included in the count here. Cf. the links and further comments at A258019.
LINKS
Guo, Hansen, Zheng, Boundary uniqueness of fusenes, Discrete Applied Mathematics 118 (2002), pp. 209-222.
Eric Weisstein's World of Mathematics, Fusene
Wikipedia, Helicene
FORMULA
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Antti Karttunen, Jun 02 2015
STATUS
approved