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A056501
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Number of primitive (period n) periodic palindromes using exactly five different symbols.
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0
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0, 0, 0, 0, 0, 0, 0, 60, 120, 960, 1800, 9300, 16800, 7140, 0, 126000, 480000, 834120, 2968440, 5103000, 17354340, 296, 7600, 97566000, 165528000, 533264700, 901020120, 2854995360, 4809004080, 15050445900
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,8
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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)*A056491(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. A056466.
Sequence in context: A087004 A177871 A049058 * A056491 A044247 A044628
Adjacent sequences: A056498 A056499 A056500 * A056502 A056503 A056504
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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