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A056465 Number of primitive (aperiodic) palindromes using exactly four different symbols. 4
0, 0, 0, 0, 0, 0, 24, 24, 240, 240, 1560, 1560, 8400, 8376, 40824, 40800, 186480, 186240, 818520, 818280, 3497976, 3496440, 14676024, 14674440, 60780720, 60772320, 249401640, 249393480, 1016542800, 1016501736, 4123173624, 4123132800, 16664093400, 16663908480 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

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

Andrew Howroyd, Table of n, a(n) for n = 1..200

FORMULA

a(n) = Sum_{d|n} mu(d)*A056455(n/d).

CROSSREFS

Column 4 of A327873.

Cf. A056455, A056460.

Sequence in context: A122505 A103640 A004011 * A056455 A128378 A165845

Adjacent sequences:  A056462 A056463 A056464 * A056466 A056467 A056468

KEYWORD

nonn

AUTHOR

Marks R. Nester

EXTENSIONS

Terms a(31) and beyond from Andrew Howroyd, Sep 28 2019

STATUS

approved

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)