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Search: id:A056314
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| A056314 |
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Number of primitive (aperiodic) reversible strings with n beads using a maximum of three different colors. |
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+0
4
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| 3, 3, 15, 39, 132, 357, 1131, 3276, 9945, 29508, 88935, 265668, 798252, 2391441, 7177584, 21523320, 64579920, 193709763, 581160255, 1743392040, 5230264026, 15690529437, 47071855131, 141214764600
(list; graph; listen)
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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)*A032120(n/d) where d|n.
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CROSSREFS
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Cf. A045625.
Sequence in context: A089875 A035617 A126319 this_sequence A078631 A046983 A067655
Adjacent sequences: A056311 A056312 A056313 this_sequence A056315 A056316 A056317
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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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