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A056519
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Number of primitive (period n) periodic palindromic structures using exactly three different symbols.
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0
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0, 0, 0, 1, 1, 5, 6, 18, 25, 63, 90, 202, 301, 650, 965, 2016
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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REFERENCES
| M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
| A056514(n)-A056513(n).
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EXAMPLE
| 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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CROSSREFS
| Cf. A056482.
Sequence in context: A041747 A180134 A192727 * A063445 A031448 A163772
Adjacent sequences: A056516 A056517 A056518 * A056520 A056521 A056522
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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