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A056517
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Number of primitive (period n) periodic palindromic structures using a maximum of six different symbols.
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1
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1, 1, 1, 3, 4, 10, 14, 36, 50, 138, 202, 561, 875, 2571, 4105
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. 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)*A056507(n/d) where d|n.
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CROSSREFS
| Cf. A056480.
Sequence in context: A007068 A056515 A056516 * A048155 A204292 A103080
Adjacent sequences: A056514 A056515 A056516 * A056518 A056519 A056520
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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EXTENSIONS
| Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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