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Search: id:A056423
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| A056423 |
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Number of primitive (period n) step cyclic shifted sequences using a maximum of six different symbols. |
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+0
3
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| 6, 15, 50, 210, 456, 4220, 6960, 57330, 188810, 1518558, 3302916, 45916780, 83747280, 933074430, 3920355200, 22075393725, 62230996500, 940379117630, 1781757016320, 22856963695482, 87052415634120
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OFFSET
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1,1
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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)*A056414(n/d) where d|n.
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CROSSREFS
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Sequence in context: A095122 A082637 A106272 this_sequence A056347 A122365 A146746
Adjacent sequences: A056420 A056421 A056422 this_sequence A056424 A056425 A056426
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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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