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

%I #9 Sep 29 2019 11:10:56

%S 0,0,0,0,0,0,0,0,120,120,1800,1800,16800,16800,126000,126000,834120,

%T 834000,5103000,5102880,29607600,29605800,165528000,165526200,

%U 901020120,901003320,4809004080,4808987400,25292030400,25291904280,131542866000,131542740000

%N Number of primitive (aperiodic) palindromes using exactly five 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="/A056466/b056466.txt">Table of n, a(n) for n = 1..200</a>

%F a(n) = Sum_{d|n} mu(d)*A056456(n/d).

%Y Column 5 of A327873.

%Y Cf. A056456, A056461.

%K nonn

%O 1,9

%A _Marks R. Nester_

%E Terms a(30) and beyond from _Andrew Howroyd_, Sep 29 2019