login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A032228 Number of ways to partition n elements into pie slices of different sizes allowing the pie to be turned over. 1
1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 12, 14, 19, 24, 32, 50, 61, 82, 109, 145, 187, 299, 359, 498, 646, 875, 1113, 1502, 2202, 2753, 3688, 4833, 6362, 8234, 10792, 13762, 20059, 24610, 32860, 42074, 55649, 70308, 92341, 116189, 150351, 207101 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..1000

C. G. Bower, Transforms (2)

FORMULA

"DGK" (bracelet, element, unlabeled) transform of 1, 1, 1, 1...

PROG

(PARI) seq(n)={Vec(1 + sum(k=1, n, my(r=(k*(k+1))/2); if(r<=n, if(k>2, (k-1)!, 2) * x^r / prod(j=1, k, 1 - x^j + O(x*x^(n-r)))))/2)} \\ Andrew Howroyd, Sep 20 2018

CROSSREFS

Sequence in context: A173692 A316079 A091585 * A091583 A245438 A245439

Adjacent sequences:  A032225 A032226 A032227 * A032229 A032230 A032231

KEYWORD

nonn

AUTHOR

Christian G. Bower

EXTENSIONS

a(0)=1 prepended by Andrew Howroyd, Sep 20 2018

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 17 22:48 EDT 2018. Contains 316297 sequences. (Running on oeis4.)