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A032172 Number of rooted compound windmills with n nodes and leaves of 2 colors with no symmetries. 1

%I #13 Jun 20 2018 16:34:40

%S 2,2,3,9,27,93,317,1148,4203,15781,60066,231968,905301,3567982,

%T 14175319,56722193,228380002,924598874,3761536993,15370095298,

%U 63051505041,259573763572,1072091242996,4441058718736

%N Number of rooted compound windmills with n nodes and leaves of 2 colors with no symmetries.

%H Andrew Howroyd, <a href="/A032172/b032172.txt">Table of n, a(n) for n = 1..200</a>

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

%F Shifts left under "CHK" (necklace, identity, unlabeled) transform.

%o (PARI)

%o CHK(p,n)={sum(d=1, n, moebius(d)/d*log(subst(1/(1+O(x*x^(n\d))-p), x, x^d)))}

%o seq(n)={my(p=O(1));for(i=1, n, p=2+CHK(x*p, i)); Vec(p)} \\ _Andrew Howroyd_, Jun 20 2018

%K nonn

%O 1,1

%A _Christian G. Bower_

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Last modified April 25 10:51 EDT 2024. Contains 371967 sequences. (Running on oeis4.)