S(n,k) is defined as follows.
- S(n,k)=1 when n=0
- S(n,k)=n when k=0
- S(n,k)=S(n,k−1)×S(n−1,k) otherwise
Apply the rules in the order listed.
For example, S(7,1)=7!, and S(5,3)=S(5,2)×S(4,3)=S(5,1)×S(4,2)×S(4,3).
Given N and K, count the divisors of S(N,K).