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Search: id:A056506
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| A056506 |
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Number of periodic palindromic structures using a maximum of five different symbols. |
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+0
4
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| 1, 2, 2, 5, 5, 13, 15, 41, 52, 143, 202, 564, 855, 2433, 3845, 11101
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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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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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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No formula known - terms found by computer search.
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CROSSREFS
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Cf. A056470.
Sequence in context: A122205 A094967 A056505 this_sequence A056507 A095014 A129996
Adjacent sequences: A056503 A056504 A056505 this_sequence A056507 A056508 A056509
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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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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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