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A056407
Number of primitive (aperiodic) step shifted (decimated) sequence structures using exactly three different symbols.
0
0, 0, 1, 4, 8, 49, 54, 280, 524, 2362, 2872, 22694, 21866, 131696, 298783, 904634, 1341518, 10744516, 10748218, 72886710, 145274501, 522816718, 713023210, 5892611212, 7059926597, 35300963684, 70604007679
OFFSET
1,4
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
CROSSREFS
Cf. A056387.
Sequence in context: A045882 A051681 A267987 * A329942 A056397 A369074
KEYWORD
nonn
STATUS
approved