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A056367
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Number of primitive (period n) bracelet structures using exactly three different colored beads.
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0
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0, 0, 1, 2, 5, 13, 31, 80, 201, 533, 1401, 3822, 10395, 28859, 80201, 225286, 634265, 1796433, 5100325, 14534758, 41513402, 118879249, 341094843, 980661980, 2824223490, 8146897815, 23535345170
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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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
| A056362(n)-A000046(n).
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CROSSREFS
| Cf. A056304.
Sequence in context: A076501 A200772 A099515 * A082733 A095134 A086758
Adjacent sequences: A056364 A056365 A056366 * A056368 A056369 A056370
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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