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Search: id:A056448
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| A056448 |
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Number of primitive (period n) step cyclic shifted sequence structures using exactly six different symbols. |
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1
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| 0, 0, 0, 0, 0, 1, 1, 18, 59, 630, 1681, 28866, 60083, 757576, 3514504, 21423984, 64372109, 1024999170, 2026631203, 26920954613, 105501588414, 742299897060, 1974251382095, 31721456288956, 74052852505684
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OFFSET
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1,8
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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. Permuting the symbols will not change the structure.
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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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A056443(n)-A056442(n).
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CROSSREFS
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Cf. A056428.
Sequence in context: A155155 A048356 A027055 this_sequence A056438 A105521 A154563
Adjacent sequences: A056445 A056446 A056447 this_sequence A056449 A056450 A056451
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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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