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Search: id:A056425
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| A056425 |
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Number of primitive (period n) step cyclic shifted sequences using exactly three different symbols. |
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+0
2
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| 0, 0, 1, 6, 9, 55, 51, 252, 379, 1491, 1611, 12236, 10245, 57057, 121711, 345888, 474489, 3589099, 3397143, 21983298, 41570721, 142617777, 186027579, 1476401628, 1694455311, 8146623393, 15690140775
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OFFSET
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1,4
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COMMENT
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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
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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)*A056416(n/d) where d|n.
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CROSSREFS
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Cf. A056420.
Sequence in context: A154139 A126110 A098662 this_sequence A056416 A061401 A046498
Adjacent sequences: A056422 A056423 A056424 this_sequence A056426 A056427 A056428
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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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