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A056423
Number of primitive (period n) step cyclic shifted sequences using a maximum of six different symbols.
2
6, 15, 50, 210, 456, 4220, 6960, 57330, 188810, 1518558, 3302916, 45916780, 83747280, 933074430, 3920355200, 22075393725, 62230996500, 940379117630, 1781757016320, 22856963695482, 87052415634120
OFFSET
1,1
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)*A056414(n/d) where d|n.
CROSSREFS
Sequence in context: A270455 A318414 A106272 * A056347 A271332 A244024
KEYWORD
nonn
STATUS
approved