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A056366
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Number of primitive (period n) bracelet structures using exactly two different colored beads.
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0
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0, 1, 1, 2, 3, 5, 8, 14, 21, 39, 62, 112, 189, 352, 607, 1144, 2055, 3885, 7154, 13602, 25472, 48670, 92204, 176770, 337590, 649341, 1246840, 2404872, 4636389, 8964143, 17334800
(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. Identical to A000046 for n>1.
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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
| A000046(n)-A000007(n-1).
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CROSSREFS
| Cf. A056303.
Sequence in context: A082931 A034413 A034416 * A000046 A131132 A004692
Adjacent sequences: A056363 A056364 A056365 * A056367 A056368 A056369
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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