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Search: id:A056426
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| A056426 |
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Number of primitive (period n) step cyclic shifted sequences using exactly four different symbols. |
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+0
2
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| 0, 0, 0, 3, 12, 136, 204, 1434, 3520, 20688, 31956, 317374, 390364, 2973332, 8504708, 32469954, 61276740, 622084744, 790198476, 6798276744, 17290257884, 79394924652, 138325216092, 1460955163540
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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.
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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)*A056417(n/d) where d|n.
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CROSSREFS
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Cf. A056421.
Sequence in context: A073987 A138392 A035087 this_sequence A056417 A098152 A028301
Adjacent sequences: A056423 A056424 A056425 this_sequence A056427 A056428 A056429
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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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