A032135 - OEIS

%I #9 Sep 12 2018 16:08:09

%S 1,2,1,7,9,21,268,491,1893,5809,166476,373275,1812374,8077317,

%T 38851660,1934306029,5374689421,30125069097,152234643292,991832638619,

%U 5660219512530,516732891172537,1664067117563368

%N "CFJ" (necklace, size, labeled) transform of 2,1,1,1...

%H Andrew Howroyd, <a href="/A032135/b032135.txt">Table of n, a(n) for n = 0..200</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+serlaplace((1 + 2*x*y)*prod(k=2, n, 1 + x^k*y/k! + O(x*x^n))))] \\ _Andrew Howroyd_, Sep 12 2018

%K nonn

%O 0,2

%A _Christian G. Bower_

%E a(0)=1 prepended by _Andrew Howroyd_, Sep 12 2018