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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
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.
Sequence in context: A185335 A262752 A138416 * A274066 A055997 A115599
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.)