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Search: id:A056441
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| A056441 |
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Number of primitive (period n) step cyclic shifted sequence structures using a maximum of four different symbols. |
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+0
3
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| 1, 1, 2, 5, 6, 29, 28, 142, 242, 1222, 1664, 15935, 18198, 134452, 376424, 1415060, 2634596, 26534337, 33499358, 287001476, 727425470, 3332039278, 5794658930, 61120838930, 93825569002, 601444720052
(list; graph; listen)
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OFFSET
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1,3
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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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sum mu(d)*A056431(n/d) where d|n.
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CROSSREFS
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Cf. A056421.
Sequence in context: A128367 A137067 A008555 this_sequence A164805 A152918 A055877
Adjacent sequences: A056438 A056439 A056440 this_sequence A056442 A056443 A056444
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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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