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Search: id:A056315
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| A056315 |
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Number of primitive (aperiodic) reversible strings with n beads using a maximum of four different colors. |
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+0
3
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| 4, 6, 36, 126, 540, 2034, 8316, 32760, 131544, 524250, 2099196, 8388450, 33562620, 134217594, 536903100, 2147483520, 8590065660, 34359735816, 137439477756, 549755813250, 2199025344348, 8796093020154
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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)*A032121(n/d) where d|n.
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CROSSREFS
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Cf. A045625, A056314.
Sequence in context: A137021 A092187 A092765 this_sequence A103234 A074061 A125081
Adjacent sequences: A056312 A056313 A056314 this_sequence A056316 A056317 A056318
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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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