%I #9 Jun 21 2018 15:03:51
%S 1,1,2,5,7,15,31,51,86,171,388,575,1093,1795,3417,7825,11754,20585,
%T 35432,59947,103943,244933,349513,622059,1004616,1720341,2717372,
%U 4781105,10523263,15182123,25982763,41761399,68419002,108231183
%N "CFK" (necklace, size, unlabeled) transform of 1,2,3,4...
%H Andrew Howroyd, <a href="/A032141/b032141.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
%o (PARI) seq(n)={apply(p->subst(serlaplace(p/y), y, 1), Vec(y-1+prod(k=1, n, 1 + k*x^k*y + O(x*x^n))))} \\ _Andrew Howroyd_, Jun 21 2018
%K nonn
%O 0,3
%A _Christian G. Bower_
%E a(0)=1 prepended by _Andrew Howroyd_, Jun 21 2018