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A056318
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Number of primitive (aperiodic) reversible strings with n beads using exactly two different colors.
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1
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0, 1, 4, 7, 18, 29, 70, 126, 266, 507, 1054, 2037, 4158, 8183, 16488, 32760, 65790, 131026, 262654, 524265, 1049524, 2097119, 4196350, 8388450, 16781292, 33554367, 67116784, 134217657, 268451838
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| A string and its reverse are considered to be equivalent. Identical to A045625 for n>1.
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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)*A056309(n/d) where d|n.
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CROSSREFS
| Cf. A045625.
Sequence in context: A080650 A005509 A147366 * A011948 A146387 A124400
Adjacent sequences: A056315 A056316 A056317 * A056319 A056320 A056321
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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