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A056496
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Number of primitive (period n) periodic palindromes using a maximum of five different symbols.
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0
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5, 10, 20, 60, 120, 340, 620, 1800, 3100, 9240, 15620, 46440, 78120, 233740, 390480, 1170000, 1953120, 5855900, 9765620, 29287440, 48827480, 146468740, 244140620, 732373200, 1220703000, 3662031240
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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
| Sum mu(d)*A056487(n/d) where d|n.
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EXAMPLE
| For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome.
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CROSSREFS
| Cf. A056461.
Sequence in context: A102260 A023383 A092407 * A106367 A002791 A080399
Adjacent sequences: A056493 A056494 A056495 * A056497 A056498 A056499
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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