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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure.
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REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| Sum mu(d)*A056393(n/d) where d|n.
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CROSSREFS
| Cf. A056383.
Sequence in context: A197531 A117108 A145796 * A181349 A174180 A106676
Adjacent sequences: A056400 A056401 A056402 * A056404 A056405 A056406
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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