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A056403
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Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of four different symbols.
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2
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1, 1, 3, 9, 16, 102, 130, 800, 1889, 11089, 17598, 179255, 233448, 1865925, 5603767, 22468480, 44744046, 477260541, 636308684, 5732446015, 15272176563, 73301037291, 133274359128, 1466413083360
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OFFSET
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1,3
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COMMENTS
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See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure.
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REFERENCES
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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]
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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