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A056354
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Number of bracelet structures using a maximum of four different colored beads.
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3
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1, 2, 3, 7, 11, 33, 73, 237, 703, 2433, 8309, 30108, 108991, 403262, 1497070, 5607437, 21076571, 79595990, 301492045, 1145560579, 4363503684, 16660204452, 63741248201, 244339646708, 938255682551
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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
| Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
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CROSSREFS
| Cf. A056292.
Sequence in context: A138000 A034295 A140108 * A072534 A056292 A106125
Adjacent sequences: A056351 A056352 A056353 * A056355 A056356 A056357
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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