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A056363
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Number of primitive (period n) bracelet structures using a maximum of four different colored beads.
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2
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1, 1, 2, 5, 10, 29, 72, 230, 700, 2421, 8308, 30070, 108990, 403188, 1497057, 5607200, 21076570, 79595257, 301492044, 1145558141, 4363503609, 16660196142, 63741248200, 244339616370, 938255682540
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure.
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REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| sum mu(d)*A056354(n/d) where d|n.
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CROSSREFS
| Cf. A056300.
Sequence in context: A102964 A075885 A018377 * A006404 A101957 A047113
Adjacent sequences: A056360 A056361 A056362 * A056364 A056365 A056366
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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