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A056459
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Number of primitive (aperiodic) palindromes using a maximum of three different symbols.
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4
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3, 0, 6, 6, 24, 18, 78, 72, 234, 216, 726, 696, 2184, 2106, 6528, 6480, 19680, 19422, 59046, 58800, 177060, 176418, 531438, 530640, 1594296, 1592136, 4782726, 4780776, 14348904, 14342112, 43046718, 43040160, 129139428, 129120480, 387420384, 387400104, 1162261464, 1162202418, 3486782208
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listen;
history;
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internal format)
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OFFSET
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1,1
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REFERENCES
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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]
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LINKS
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FORMULA
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a(n) = Sum_{d | n} mu(d)*A056449(n/d).
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PROG
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(PARI) a(n) = sumdiv(n, d, moebius(d)*3^((1 + n/d)\2));
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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