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A056459 Number of primitive (aperiodic) palindromes using a maximum of three different symbols. 4
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
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)*A056449(n/d).
PROG
(PARI) a(n) = sumdiv(n, d, moebius(d)*3^((1 + n/d)\2));
for(n=1, 40, print1(a(n), ", ")); \\ Petros Hadjicostas, Apr 24 2020
CROSSREFS
Cf. A056449.
Column 3 of A284823.
Sequence in context: A019808 A182145 A201569 * A021330 A199055 A016598
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Petros Hadjicostas, Apr 24 2020
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)