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A056425 Number of primitive (period n) step cyclic shifted sequences using exactly three different symbols. +0
2
0, 0, 1, 6, 9, 55, 51, 252, 379, 1491, 1611, 12236, 10245, 57057, 121711, 345888, 474489, 3589099, 3397143, 21983298, 41570721, 142617777, 186027579, 1476401628, 1694455311, 8146623393, 15690140775 (list; graph; listen)
OFFSET

1,4

COMMENT

See A056371 for an explanation of step shifts. Under step cyclic shifts, abcde, bdace, bcdea, cdeab and daceb etc. are equivalent.

REFERENCES

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.

FORMULA

sum mu(d)*A056416(n/d) where d|n.

CROSSREFS

Cf. A056420.

Sequence in context: A154139 A126110 A098662 this_sequence A056416 A061401 A046498

Adjacent sequences: A056422 A056423 A056424 this_sequence A056426 A056427 A056428

KEYWORD

nonn

AUTHOR

Marks R. Nester (nesterm(AT)dpi.qld.gov.au)

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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