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Number of primitive (aperiodic) palindromes using exactly six different symbols.
4

%I #10 Sep 29 2019 11:39:30

%S 0,0,0,0,0,0,0,0,0,0,720,720,15120,15120,191520,191520,1905120,

%T 1905120,16435440,16435440,129230640,129229920,953029440,953028720,

%U 6711344640,6711329520,45674188560,45674173440,302899156560,302898965040,1969147121760,1969146930240

%N Number of primitive (aperiodic) palindromes using exactly six different symbols.

%D 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]

%H Andrew Howroyd, <a href="/A056467/b056467.txt">Table of n, a(n) for n = 1..200</a>

%F a(n) = Sum_{d|n} mu(d)*A056457(n/d).

%Y Column 6 of A327873.

%Y Cf. A056457, A056462.

%K nonn

%O 1,11

%A _Marks R. Nester_

%E Terms a(28) and beyond from _Andrew Howroyd_, Sep 29 2019