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A056495
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Number of primitive (period n) periodic palindromes using a maximum of four different symbols.
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0
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4, 6, 12, 30, 60, 138, 252, 600, 1008, 2490, 4092, 10050, 16380, 40698, 65460, 163200, 262140, 654192, 1048572, 2618850, 4194036, 10481658, 16777212, 41932200, 67108800, 167755770, 268434432, 671047650
(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)*A056486(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. A056460.
Sequence in context: A115076 A126259 A092320 * A178674 A025018 A102043
Adjacent sequences: A056492 A056493 A056494 * A056496 A056497 A056498
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KEYWORD
| nonn
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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