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A056393
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Number of step shifted (decimated) sequence structures using a maximum of four different symbols.
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3
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1, 2, 4, 11, 17, 107, 131, 811, 1893, 11107, 17599, 179371, 233449, 1866057, 5603787, 22469291, 44744047, 477262537, 636308685, 5732457131, 15272176697, 73301054891, 133274359129, 1466413263531
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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
| Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
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CROSSREFS
| Cf. A056373.
Sequence in context: A018625 A123557 A182642 * A056394 A056395 A053031
Adjacent sequences: A056390 A056391 A056392 * A056394 A056395 A056396
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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