A056465 Number of primitive (aperiodic) palindromes using exactly four different symbols.

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

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: A103640 A004011 A334570 * 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