For this you can use pascal triangle . It will give the permutation
value of the the series .
           1
       1   2   1
     1   3    3   1
   1   4  6     4  1
 1  5 10   10   5  1
1  6 15  20   15    1


This can easily prepreocessed using dynamic method way .


a[0][i]=1   1<=i<=n
a[i][0]=1   1<=i<=n
a[i][j] = a[i-1][j-1]+a[i][j-1]


try this out ....!!!!

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