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A328742
Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using a maximum of three different colored beads.
3
1, 1, 0, 1, 2, 8, 17, 52, 130, 363, 968, 2684, 7338, 20440, 56836, 159424, 448130, 1266080, 3586479, 10195276, 29054568, 83018624, 237729932, 682196948, 1961301330, 5648590728, 16293970840, 47071589049, 136171269780, 394427456120, 1143839302904, 3320824711204
OFFSET
0,5
COMMENTS
Permuting the colors does not change the structure.
LINKS
FORMULA
a(n) = Sum_{k=1..3} A327693(n, k) for n > 0.
a(p) = A002075(p) for prime p >= 5.
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Oct 26 2019
STATUS
approved