The second kind of Stirling number

This program is to calculate the second kind of Stirling number.
You can input the integer n and m, and the result S(n,m) will be shown.
The corresponding C code is shown at the bottom.

Input the integer n(1--19):
Input the integer m(1--19 and m<=n):


The second kind of Stirling number S(n,m) is: