A032160 - OEIS

%I #14 Sep 20 2018 16:31:52

%S 1,1,1,2,3,6,13,28,61,138,325,758,1804,4317,10457,25484,62478,154000,

%T 381494,949217,2370840,5943552,14946766,37700390,95346724,241744854,

%U 614328965,1564488480,3992092421,10205366192

%N Number of rooted compound windmills with n nodes where any 2 submills extending from the same node are different.

%H Andrew Howroyd, <a href="/A032160/b032160.txt">Table of n, a(n) for n = 1..200</a>

%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>

%H <a href="/index/Mo#mobiles">Index entries for sequences related to mobiles</a>

%F Shifts left under "CGK" (necklace, element, unlabeled) transform.

%o (PARI)

%o CGK(v)={apply(p->subst(serlaplace(p/y),y,1), Vec(prod(k=1, #v, (1 + x^k*y + O(x*x^#v))^v[k])-1, -#v))}

%o seq(n)={my(v=[1]); for(i=2, n, v=concat([1], CGK(v))); v} \\ _Andrew Howroyd_, Sep 20 2018

%K nonn

%O 1,4

%A _Christian G. Bower_