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Search: id:A056317
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| A056317 |
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Number of primitive (aperiodic) reversible strings with n beads using a maximum of six different colors. |
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+0
3
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| 6, 15, 120, 645, 3990, 23295, 140610, 839790, 5042610, 30232965, 181421850, 1088390415, 6530486970, 39182081385, 235093327980, 1410554953080, 8463334761210, 50779978307010, 304679900238330
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OFFSET
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1,1
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COMMENT
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A 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)*A056308(n/d) where d|n.
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CROSSREFS
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Cf. A045625.
Sequence in context: A013228 A133472 A087137 this_sequence A129421 A013227 A013223
Adjacent sequences: A056314 A056315 A056316 this_sequence A056318 A056319 A056320
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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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