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A056362 Number of primitive (period n) bracelet structures using a maximum of three different colored beads. 2
1, 1, 2, 4, 8, 18, 39, 94, 222, 572, 1463, 3934, 10584, 29211, 80808, 226430, 636320, 1800318, 5107479, 14548360, 41538874, 118927919, 341187047, 980838750, 2824561080, 8147547156, 23536592010 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure.

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

LINKS

Table of n, a(n) for n=1..27.

FORMULA

Sum mu(d)*A056353(n/d) where d divides n.

CROSSREFS

Cf. A002075.

Sequence in context: A220839 A218078 A110110 * A086585 A052910 A000967

Adjacent sequences:  A056359 A056360 A056361 * A056363 A056364 A056365

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

STATUS

approved

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Last modified May 21 18:02 EDT 2013. Contains 225504 sequences.