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Pi Recursion C++

The value of π can be determined by the series equation
Write a program that prompts the user to enter a positive odd number n and uses recursion to approximate the value of π using the given formula including term up through 1/n.

#include <iostream>
#include <cmath>
using namespace std;

double pi (double);

int main()
cout << "Enter n to value of pi: "; int n; cin>>n;
cout << pi(n) << endl;

return 0;

double pi (double n)
if (n==1)
return 4*1;
return ( 4*(pow(-1,n+1)*(1/(2*n-1))) + pi(n-1) );
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