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A056307
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Number of primitive (period n) n-bead necklace structures using exactly six different colored beads.
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2
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0, 0, 0, 0, 0, 1, 3, 36, 296, 2303, 16317, 110461, 717024, 4532102, 28046285, 170938778, 1029749994, 6149327608, 36477979041, 215304156613, 1265984738261, 7422971215512, 43433472086235, 253759842112792
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OFFSET
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1,7
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COMMENTS
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Turning over the necklace is not allowed. Colors may be permuted without changing the necklace 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. [See A056391 for pdf file of Chap. 2]
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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