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A032265 Number of ways to partition n labeled elements into pie slices of at least 2 elements allowing the pie to be turned over. 2

%I #13 Sep 13 2018 02:59:35

%S 1,0,1,1,4,11,41,162,925,5945,47017,402788,3895937,40556595,461544253,

%T 5625446270,73716523405,1028179882589,15257484239777,239529471989352,

%U 3971376169852777,69288230115817655,1269563315949912469,24366794306903776610,488969030312192567573

%N Number of ways to partition n labeled elements into pie slices of at least 2 elements allowing the pie to be turned over.

%H Andrew Howroyd, <a href="/A032265/b032265.txt">Table of n, a(n) for n = 0..200</a>

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

%F "DIJ" (bracelet, indistinct, labeled) transform of 0, 1, 1, 1, ...

%F E.g.f.: 1 + (g(x) + g(x)^2/2 - log(1-g(x)))/2 where g(x) = exp(x) - x - 1. - _Andrew Howroyd_, Sep 12 2018

%o (PARI) seq(n)={my(p=exp(x + O(x*x^n))-x-1); Vec(1 + serlaplace(p + p^2/2 - log(1-p))/2)} \\ _Andrew Howroyd_, Sep 12 2018

%K nonn

%O 0,5

%A _Christian G. Bower_

%E a(0)=1 prepended and terms a(22) and beyond from _Andrew Howroyd_, Sep 12 2018

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)