OFFSET
1,8
EXAMPLE
Case n=7: There are 7 necklace structures using exactly two colors. See example in A056295. Of these, 5 are achiral and the other two a chiral pair: AAABABB/AAABBAB. a(7) = 1, since this sequence considers chiral pairs as the same bracelet structure.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, Sep 23 2019
STATUS
approved