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Search: id:A056319
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| A056319 |
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Number of primitive (aperiodic) reversible strings with n beads using exactly three different colors. |
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+0
2
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| 0, 0, 3, 18, 78, 270, 921, 2898, 9147, 27987, 85773, 259557, 785778, 2366892, 7128120, 21425040, 64382550, 193316685, 580372293, 1741819245, 5227115454, 15684238080, 47059266081, 141189599250
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Each string and its reverse are considered to be equivalent.
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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.
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FORMULA
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Sum mu(d)*A056310(n/d) where d|n.
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CROSSREFS
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Cf. A056314.
Adjacent sequences: A056316 A056317 A056318 this_sequence A056320 A056321 A056322
Sequence in context: A059393 A094033 A043008 this_sequence A056310 A135371 A086346
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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