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Search: id:A056354
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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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+0
4
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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
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OFFSET
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1,2
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COMMENT
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Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure.
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REFERENCES
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M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
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Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
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CROSSREFS
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Cf. A056292.
Sequence in context: A138000 A034295 A140108 this_sequence A072534 A056292 A106125
Adjacent sequences: A056351 A056352 A056353 this_sequence A056355 A056356 A056357
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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