%I
%S 1,2,2,6,6,10,26,30,46,66,178,198,326,442,666,1566,1886,2882,4082,
%T 5942,8006,18426,21450,33502,45854,67314,89074,128310,252406,309498,
%U 459914,635470,904350,1214514,1702562,2240246,4261430
%N "CFK" (necklace, size, unlabeled) transform of 2,2,2,2...
%H Andrew Howroyd, <a href="/A032139/b032139.txt">Table of n, a(n) for n = 0..1000</a>
%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
%H <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%o (PARI) seq(n)={apply(p>subst(serlaplace(p/y), y, 1), Vec(y1+prod(k=1, n, 1 + 2*x^k*y + O(x*x^n))))} \\ _Andrew Howroyd_, Jun 21 2018
%K nonn
%O 0,2
%A _Christian G. Bower_
%E a(0)=1 prepended by _Andrew Howroyd_, Jun 21 2018
