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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Permuting the colors does not change the structure.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..200

FORMULA

a(n) = Sum_{k=1..3} A327693(n, k) for n > 0.

a(p) = A002075(p) for prime p >= 5.

CROSSREFS

Cf. A002075, A002076, A327693, A328740.

Sequence in context: A281470 A295147 A215933 * A341506 A154349 A268068

Adjacent sequences:  A328739 A328740 A328741 * A328743 A328744 A328745

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Oct 26 2019

STATUS

approved

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Last modified April 19 03:20 EDT 2021. Contains 343105 sequences. (Running on oeis4.)