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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 (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

Table of n, a(n) for n=1..31.

FORMULA

a(n) = Sum_{ d | n} mu(d)*A056449(n/d).

CROSSREFS

Column 3 of A284823.

Sequence in context: A019808 A182145 A201569 * A021330 A199055 A016598

Adjacent sequences:  A056456 A056457 A056458 * A056460 A056461 A056462

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

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Last modified November 18 09:17 EST 2017. Contains 294879 sequences.