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Search: id:A056421
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| A056421 |
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Number of primitive (period n) step cyclic shifted sequences using a maximum of four different symbols. |
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+0
3
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| 4, 6, 16, 45, 72, 404, 456, 2550, 5144, 26880, 38568, 367170, 431776, 3202964, 8993712, 33857520, 63177816, 636456776, 803796696, 6886253964, 17456593904, 79965511980, 139069427016, 1466861335900
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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)*A056412(n/d) where d|n.
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CROSSREFS
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Sequence in context: A113883 A036748 A076066 this_sequence A032295 A072279 A038236
Adjacent sequences: A056418 A056419 A056420 this_sequence A056422 A056423 A056424
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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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