login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A032219 Number of ways to partition n labeled elements into pie slices of different sizes allowing the pie to be turned over. 1

%I #13 Sep 11 2018 21:26:37

%S 1,1,1,4,5,16,82,169,541,2272,43166,99859,479030,2089751,13714261,

%T 493866559,1397727901,7786145776,39662742502,252997758007,

%U 2026338881050,131040136520017,427809641611111,2813929521468817

%N Number of ways to partition n labeled elements into pie slices of different sizes allowing the pie to be turned over.

%H Andrew Howroyd, <a href="/A032219/b032219.txt">Table of n, a(n) for n = 0..200</a>

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

%F "DGJ" (bracelet, element, labeled) transform of 1, 1, 1, 1...

%o (PARI) seq(n)=[subst(serlaplace(p/y + polcoeff(p,1) + polcoeff(p,2)),y,1)/2 | p <- Vec(y-1+serlaplace(prod(k=1, n, (1 + x^k*y/k! + O(x*x^n)))))] \\ _Andrew Howroyd_, Sep 11 2018

%K nonn

%O 0,4

%A _Christian G. Bower_

%E a(0)=1 prepended by _Andrew Howroyd_, Sep 11 2018

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 03:27 EDT 2024. Contains 371782 sequences. (Running on oeis4.)