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A056466
Number of primitive (aperiodic) palindromes using exactly five different symbols.
4
0, 0, 0, 0, 0, 0, 0, 0, 120, 120, 1800, 1800, 16800, 16800, 126000, 126000, 834120, 834000, 5103000, 5102880, 29607600, 29605800, 165528000, 165526200, 901020120, 901003320, 4809004080, 4808987400, 25292030400, 25291904280, 131542866000, 131542740000
OFFSET
1,9
REFERENCES
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
LINKS
FORMULA
a(n) = Sum_{d|n} mu(d)*A056456(n/d).
CROSSREFS
Column 5 of A327873.
Sequence in context: A268920 A332560 A334571 * A056456 A239535 A085218
KEYWORD
nonn
EXTENSIONS
Terms a(30) and beyond from Andrew Howroyd, Sep 29 2019
STATUS
approved