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A056420
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Number of primitive (period n) step cyclic shifted sequences using a maximum of three different symbols.
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2
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3, 3, 7, 15, 21, 79, 75, 306, 433, 1605, 1695, 12662, 10461, 57759, 122791, 347895, 476049, 3596917, 3401967, 22005312, 41597289, 142675887, 186077883, 1476684552, 1694657979, 8147271993, 15690973311
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are 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)*A056411(n/d) where d|n.
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CROSSREFS
| Sequence in context: A049772 A119470 A060368 * A030069 A004043 A104176
Adjacent sequences: A056417 A056418 A056419 * A056421 A056422 A056423
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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