A032157 - OEIS

%I #9 Sep 13 2018 15:46:06

%S 1,2,2,3,5,6,10,17,21,30,46,79,97,142,190,285,465,590,826,1131,1541,

%T 2142,3458,4281,6037,8030,10974,14295,19993,29806,37822,51517,68449,

%U 91326,119610,158315,208525,306606,381674,515193,669605

%N "CGK" (necklace, element, unlabeled) transform of 2,1,1,1,...

%H Andrew Howroyd, <a href="/A032157/b032157.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)=[subst(serlaplace(p/y),y,1) | p <- Vec(y-1+(1 + x*y)*prod(k=1, n, 1 + x^k*y + O(x*x^n)))] \\ _Andrew Howroyd_, Sep 13 2018

%K nonn

%O 0,2

%A _Christian G. Bower_

%E a(0)=1 prepended by _Andrew Howroyd_, Sep 13 2018