Permutations and combinations and their enumeration
Please select a type and input n and k.

   P(n,n) ordered no repetition n! n: 
   P(n,k) ordered no repetition n!/(n - k)! k: 
   P(n,k) ordered repetition allowed nk
   C(n,k) unordered repetition allowed (n + k - 1)!/((k!(n-1)!)
   C(n,k) unordered no repetition n!/(k!(n - k)!)   

Note: This Javascript program is taken from the website CCCC Collatz Conjecture Calculation Center by Klaas Ijntema

The program is not included in the page as well as not downlodable from according to the following author's conditions:

Last updated: November 2010