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A056316
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Number of primitive (aperiodic) reversible strings with n beads using a maximum of five different colors.
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2
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5, 10, 70, 310, 1620, 7790, 39370, 195300, 978050, 4882740, 24421870, 122069940, 610390620, 3051757490, 15258982680, 76293945000, 381470703120, 1907348623450, 9536748046870, 47683715818440
(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)*A032122(n/d) where d|n.
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CROSSREFS
| Cf. A045625.
Sequence in context: A054884 A174937 A180851 * A156102 A120834 A089745
Adjacent sequences: A056313 A056314 A056315 * A056317 A056318 A056319
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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