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A056391
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Number of step shifted (decimated) sequence structures using a maximum of two different symbols.
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3
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1, 2, 3, 6, 6, 20, 14, 48, 52, 140, 108, 624, 352, 1400, 2172, 4464, 4116, 22112, 14602, 68016, 88376, 209936, 190746, 1075200, 839128, 2797000, 3730584, 11276704, 9587580, 67195520, 35792568
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OFFSET
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1,2
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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.
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LINKS
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Table of n, a(n) for n=1..31.
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FORMULA
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Use de Bruijn's generalization of Polya's enumeration theorem as discussed in reference.
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CROSSREFS
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Cf. A056371.
Sequence in context: A102625 A117777 A049297 * A056430 A089878 A057545
Adjacent sequences: A056388 A056389 A056390 * A056392 A056393 A056394
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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STATUS
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approved
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