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A056478
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Number of primitive (aperiodic) palindromic structures using a maximum of four different symbols.
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5
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1, 1, 0, 1, 1, 4, 3, 14, 13, 49, 46, 186, 181, 714, 700, 2789, 2780, 11050, 10997, 43946, 43895, 175259, 175088, 700074, 699875, 2798246, 2797536, 11188856, 11188191, 44747434, 44744591, 178973354, 178970560, 715860463, 715849600, 2863377048, 2863365834
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OFFSET
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0,6
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COMMENTS
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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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a(n) = Sum_{d|n} mu(d)*A124303(ceiling(n/(2*d))) for n > 0.
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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(32) and beyond from Andrew Howroyd, Oct 02 2019
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STATUS
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approved
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