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Search: id:A056447
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| A056447 |
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Number of primitive (period n) step cyclic shifted sequence structures using exactly five different symbols. |
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1
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| 0, 0, 0, 0, 1, 3, 6, 52, 148, 1139, 2306, 30118, 48476, 478951, 1762916, 8601578, 20789656, 268188491, 431583572, 4685757971, 15045763306, 86991020695, 190548007556, 2526401778030, 4873374476387, 39199367113661
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OFFSET
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1,6
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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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A056442(n)-A056441(n).
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CROSSREFS
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Cf. A056427.
Adjacent sequences: A056444 A056445 A056446 this_sequence A056448 A056449 A056450
Sequence in context: A032322 A111752 A102931 this_sequence A056437 A012275 A067608
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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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