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Search: id:A056282
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| A056282 |
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Number of primitive (aperiodic) word structures of length n which contain exactly six different symbols. |
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+0
1
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| 0, 0, 0, 0, 0, 1, 21, 266, 2646, 22827, 179487, 1323651, 9321312, 63436352, 420693273, 2734926292, 17505749898, 110687248392, 693081601779, 4306078872557, 26585679462783, 163305339165738, 998969857983405
(list; graph; listen)
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OFFSET
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1,7
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COMMENT
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Permuting the alphabet will not change a word structure. Thus aabc and bbca have the same 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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FORMULA
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sum mu(d)*A000770(n/d) where d|n and n>0.
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CROSSREFS
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Cf. A056271.
Sequence in context: A045505 A092794 A133717 this_sequence A000770 A133105 A032535
Adjacent sequences: A056279 A056280 A056281 this_sequence A056283 A056284 A056285
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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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