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A056297
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n-bead necklace structures using exactly four different colored beads.
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2
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0, 0, 0, 1, 2, 13, 50, 221, 866, 3437, 13250, 51075, 194810, 742651, 2823766, 10738881, 40843370, 155494751, 592614050, 2261625725, 8643289534, 33080920607, 126797503250, 486710971595, 1870851589554
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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COMMENTS
| Turning over the necklace is not allowed. Colors may be permuted without changing the necklace 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
| A056292(n)-A002076(n).
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CROSSREFS
| Cf. A056284.
Sequence in context: A005584 A072416 A056305 * A037383 A034476 A030517
Adjacent sequences: A056294 A056295 A056296 * A056298 A056299 A056300
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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