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Search: id:A056439
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| A056439 |
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Number of primitive (period n) step cyclic shifted sequence structures using a maximum of two different symbols. |
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+0
3
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| 1, 1, 1, 2, 2, 5, 4, 10, 9, 22, 14, 78, 36, 124, 180, 343, 260, 1329, 804, 3732, 4428, 9742, 8384, 47364, 33778, 108292, 138756, 408244, 331184, 2251604, 1155734
(list; graph; listen)
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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. 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)*A056429(n/d) where d divides n.
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CROSSREFS
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Cf. A002730.
Sequence in context: A091769 A034402 A095057 this_sequence A056444 A112472 A124506
Adjacent sequences: A056436 A056437 A056438 this_sequence A056440 A056441 A056442
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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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