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A056503
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Periodic palindromic structures using a maximum of two different symbols.
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4
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1, 2, 2, 4, 4, 7, 8, 14, 16, 26, 32, 51, 64, 100, 128, 198
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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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.
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LINKS
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Table of n, a(n) for n=1..16.
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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. A016116.
Sequence in context: A222738 A005308 A151532 * A055636 A206559 A143419
Adjacent sequences: A056500 A056501 A056502 * A056504 A056505 A056506
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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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STATUS
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approved
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