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A056464
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Number of primitive (aperiodic) palindromes using exactly three different symbols.
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3
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0, 0, 0, 0, 6, 6, 36, 36, 150, 144, 540, 534, 1806, 1770, 5790, 5760, 18150, 17994, 55980, 55830, 170970, 170466, 519156, 518580, 1569744, 1567944, 4733670, 4732014, 14250606, 14244660, 42850116, 42844320, 128746410, 128728800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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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)*A056454(n/d) where d|n.
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MAPLE
| with(numtheory):with(combinat, stirling2):A056454:=n->3!*stirling2(floor((n+1)/2), 3); A056464:=n->add(mobius(d)*A056454(n/d), d=divisors(n)); (C. Ronaldo)
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CROSSREFS
| Cf. A056459.
Sequence in context: A015699 A165827 A111437 * A056454 A056452 A183622
Adjacent sequences: A056461 A056462 A056463 * A056465 A056466 A056467
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KEYWORD
| nonn,base
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AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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