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A056405
Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of six different symbols.
1
1, 1, 3, 9, 17, 112, 160, 1182, 3526, 27550, 60332, 863283, 1636608, 19121869, 84580104, 501914374, 1492170608, 23751681540, 47340359590, 637742792823, 2546703019081, 18317620779149, 49923584451714
OFFSET
1,3
COMMENTS
See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure.
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)*A056395(n/d) where d|n.
CROSSREFS
Cf. A056385.
Sequence in context: A105538 A374692 A056404 * A009216 A103072 A109228
KEYWORD
nonn
STATUS
approved