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A056335
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Number of primitive (aperiodic) reversible string structures with n beads using a maximum of six different colors.
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1
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1, 1, 3, 9, 31, 112, 466, 2124, 10476, 55058, 301632, 1703989, 9819215, 57364723, 338134486, 2005132504, 11937364183, 71254885362, 426063226936, 2550552259119, 15280103806730, 91588103894781
(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. Permuting the colors will not change the structure.
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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)*A056325(n/d) where d|n.
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CROSSREFS
| Cf. A056317.
Sequence in context: A101473 A056334 A063032 * A049188 A049165 A052709
Adjacent sequences: A056332 A056333 A056334 * A056336 A056337 A056338
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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