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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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5
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1, 1, 2, 2, 5, 5, 13, 15, 41, 52, 143, 202, 564, 855, 2433, 3845, 11101, 18002, 52662, 86472, 255128, 422005, 1252898, 2079475, 6197590, 10306752, 30796243, 51263942, 153411664, 255514355, 765393943, 1275163905, 3822001141, 6368612302, 19095317552, 31821472612
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OFFSET
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0,3
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COMMENTS
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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. [See A056391 for pdf file of Chap. 2]
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(0)=1 prepended and terms a(17) and beyond from Andrew Howroyd, Oct 01 2019
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STATUS
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approved
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