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A056425
Number of primitive (period n) step cyclic shifted sequences using exactly three different symbols.
1
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
OFFSET
1,4
COMMENTS
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. [See A056391 for pdf file of Chap. 2]
FORMULA
sum mu(d)*A056416(n/d) where d|n.
CROSSREFS
Cf. A056420.
Sequence in context: A340819 A254207 A098662 * A056416 A061401 A359800
KEYWORD
nonn
STATUS
approved