rec_38_II_2

#include <iostream>

using namespace std;

static double rec(int n )
{

    if (n < 1) return 0;
    return n == 1 ? 5 : rec(n - 1) /((n-1) * (n-1) + n);
}
 int main()

 {
         int b1 = 5;
         int n;
         cout << " Enter number of element: ";
         cin >> n;
         double bn;
         bn = rec (n);
         if(bn == 0)
             cout << "Incorrect number of elements!";
         else cout << " n-elrment: " << bn;
        return 0;
 }