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 A328741 Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using exactly four different colored beads. 4
 0, 0, 0, 0, 2, 9, 50, 206, 862, 3384, 13250, 50852, 194810, 741884, 2823712, 10735998, 40843370, 155483873, 592614050, 2261585918, 8643288808, 33080772468, 126797503250, 486710415710, 1870851589552, 7201012694120, 27752927349880, 107092389688830, 413729680838330 (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) = A056297(p) = A056305(p) for prime p. EXAMPLE For n=6, the 9 necklace structures are: aaabcd, aabacd, aabcad, aabbcd, aabcbd, aabcdb, aacbdb, ababcd, abacbd. CROSSREFS Column 4 of A327693. Cf. A056297, A056305, A328740, A328743. Sequence in context: A185335 A262752 A138416 * A274066 A055997 A115599 Adjacent sequences: A328738 A328739 A328740 * A328742 A328743 A328744 KEYWORD nonn AUTHOR Andrew Howroyd, Oct 26 2019 STATUS approved

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Last modified July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)