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A056368
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Number of primitive (period n) bracelet structures using exactly four different colored beads.
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0
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0, 0, 0, 1, 2, 11, 33, 136, 478, 1849, 6845, 26136, 98406, 373977, 1416249, 5380770, 20440250, 77794939, 296384565, 1131009781, 4321964735, 16541268223, 63400061153, 243358777620, 935431121460, 3600520732809
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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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
| A056363(n)-A056362(n).
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CROSSREFS
| Cf. A056305.
Sequence in context: A085786 A034128 A034427 * A056359 A088306 A100109
Adjacent sequences: A056365 A056366 A056367 * A056369 A056370 A056371
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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