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A328743
Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using a maximum of four different colored beads.
3
1, 1, 0, 1, 2, 10, 26, 102, 336, 1225, 4352, 15934, 58190, 215250, 798720, 2983136, 11184128, 42109450, 159070352, 602809326, 2290640486, 8726307432, 33318502400, 127479700198, 488671717040, 1876500180280, 7217306664960, 27799998938929, 107228560958610, 414124108294450
OFFSET
0,5
COMMENTS
Permuting the colors does not change the structure.
LINKS
FORMULA
a(n) = Sum_{k=1..4} A327693(n, k) for n > 0.
a(p) = A056300(p) for prime p >= 5.
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Oct 26 2019
STATUS
approved