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A056349 Number of primitive (period n) bracelets using exactly three different colored beads. 1
0, 0, 1, 6, 18, 55, 147, 405, 1083, 2961, 8043, 22182, 61278, 170883, 477910, 1344825, 3795750, 10757763, 30572427, 87146139, 248991674, 713088309, 2046303339, 5883410760, 16944543792, 48879708297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Turning over will not create a new bracelet.

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

LINKS

Table of n, a(n) for n=1..26.

FORMULA

sum mu(d)*A056343(n/d) where d|n.

CROSSREFS

Cf. A056288.

Sequence in context: A007206 A292295 A183913 * A278768 A035070 A075386

Adjacent sequences:  A056346 A056347 A056348 * A056350 A056351 A056352

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified August 3 14:46 EDT 2020. Contains 336198 sequences. (Running on oeis4.)