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 A328740 Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using exactly three different colored beads. 4
 0, 0, 0, 1, 5, 13, 43, 116, 335, 920, 2591, 7173, 20125, 56260, 158333, 446098, 1262225, 3579227, 10181479, 29028405, 82968695, 237634700, 682014587, 1960951980, 5647919640, 16292680600, 47069103545, 136166476875, 394418199725, 1143821408316, 3320790074371 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Permuting the colors does not change the structure. LINKS Andrew Howroyd, Table of n, a(n) for n = 1..200 FORMULA a(p) = A056296(p) = A056304(p) for prime p >= 5. EXAMPLE For n=5, the 5 necklace structures are: aaabc, aabac, aabbc, aabcb, ababc. CROSSREFS Column 3 of A327693. Cf. A056296, A056304, A328741, A328742. Sequence in context: A129789 A093576 A147259 * A183315 A183184 A115785 Adjacent sequences: A328737 A328738 A328739 * A328741 A328742 A328743 KEYWORD nonn AUTHOR Andrew Howroyd, Oct 26 2019 STATUS approved

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Last modified July 17 13:27 EDT 2024. Contains 374377 sequences. (Running on oeis4.)