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A032048 Number of dyslexic rooted planar trees with n nodes where any 2 subtrees extending from a node are of different sizes. 1

%I #10 Sep 20 2018 16:25:42

%S 1,1,1,2,3,6,13,29,64,148,355,857,2100,5198,12960,32701,82826,211352,

%T 541832,1397654,3614607,9402256,24500619,64134061,168178732,442710004,

%U 1166705391,3085691999,8168951368,21689446136

%N Number of dyslexic rooted planar trees with n nodes where any 2 subtrees extending from a node are of different sizes.

%H Andrew Howroyd, <a href="/A032048/b032048.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/Ro#rooted">Index entries for sequences related to rooted trees</a>

%F "CFK" (necklace, size, unlabeled) transform of A032047 (shifted right one place).

%o (PARI)

%o BFK(v)={apply(p->subst(serlaplace(y^0*p + polcoeff(p,1)),y,1)/2, Vec(-1+prod(k=1, #v, 1 + v[k]*x^k*y + O(x*x^#v)), -#v))}

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

%o seq(n)={my(v=[1]); for(i=3, n, v=concat([1], BFK(v))); concat([1], CFK(v))} \\ _Andrew Howroyd_, Sep 20 2018

%Y Cf. A032047.

%K nonn

%O 1,4

%A _Christian G. Bower_

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Last modified April 17 20:47 EDT 2024. Contains 371767 sequences. (Running on oeis4.)