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Search: id:A056505
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| A056505 |
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Number of periodic palindromic structures using a maximum of four different symbols. |
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+0
4
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| 1, 2, 2, 5, 5, 13, 15, 40, 51, 133, 187, 479, 715, 1815, 2795, 7036
(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. A007581.
Sequence in context: A056504 A122205 A094967 this_sequence A056506 A056507 A095014
Adjacent sequences: A056502 A056503 A056504 this_sequence A056506 A056507 A056508
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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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