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Search: id:A056509
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| A056509 |
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Periodic palindromic structures using exactly three different symbols. |
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+0
2
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| 0, 0, 0, 1, 1, 5, 6, 19, 25, 64, 90, 208, 301, 656, 966, 2035
(list; graph; listen)
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OFFSET
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1,6
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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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A056504(n)-A056503(n).
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EXAMPLE
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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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CROSSREFS
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Cf. A000392.
Sequence in context: A063445 A031448 A163772 this_sequence A129722 A133608 A072577
Adjacent sequences: A056506 A056507 A056508 this_sequence A056510 A056511 A056512
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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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