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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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3
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| A string and its reverse are considered to be equivalent.
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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
| Sum mu(d)*A032120(n/d) where d|n.
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CROSSREFS
| Cf. A045625.
Sequence in context: A035617 A126319 A165553 * A171379 A078631 A160639
Adjacent sequences: A056311 A056312 A056313 * A056315 A056316 A056317
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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