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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 (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..4} A327693(n, k) for n > 0.

a(p) = A056300(p) for prime p >= 5.

CROSSREFS

Cf. A056292, A056300, A327693, A328741.

Sequence in context: A321240 A322201 A099583 * A133479 A196324 A327841

Adjacent sequences:  A328740 A328741 A328742 * A328744 A328745 A328746

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Oct 26 2019

STATUS

approved

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Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)