A056349 Number of primitive (period n) bracelets using exactly three different colored beads.

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

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: A099856 A292295 A183913 * A278768 A035070 A075386

Adjacent sequences: A056346 A056347 A056348 * A056350 A056351 A056352

Keyword

nonn

Author

Marks R. Nester

Status

approved