This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A323291 Denominator of the sum of inverse products of cycle sizes in all permutations of [n]. 5
 1, 1, 2, 6, 12, 20, 360, 2520, 1680, 15120, 151200, 554400, 9979200, 129729600, 605404800, 27243216000, 54486432000, 308756448000, 5557616064000, 8122669632000, 351982350720000, 22174888095360000, 25676186215680000, 3740164458750720000, 67322960257512960000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..505 MAPLE b:= proc(n) option remember; `if`(n=0, 1, add(       b(n-j)*binomial(n-1, j-1)*(j-1)!/j, j=1..n))     end: a:= n-> denom(b(n)): seq(a(n), n=0..25); CROSSREFS See A323290 for more information. Sequence in context: A099885 A106372 A214916 * A161203 A292768 A184637 Adjacent sequences:  A323288 A323289 A323290 * A323292 A323293 A323294 KEYWORD nonn,frac AUTHOR Alois P. Heinz, Jan 09 2019 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 19 18:37 EDT 2019. Contains 322290 sequences. (Running on oeis4.)