How to Calculate a Math Suite in C++

u(n) = n.u(n-1)+(n+1).u(n-2)+n.

u(0)=3 ;

u(1)=2 ;

using namespace std;

#include< iostream>

#include< stdlib.h>

int main()

{

int n,u,i,v,w;

cost< < "Type the value of n: "; cin> > n;

u=3;

v=2;

if(n==0)

w=u;

else

if(n==1)

w=v;

else

for(int i=2; i<=n; i++)

{

w=i*v+(i+1)*u+i;

u=v;

v=w;

}

cost< < "u("< < n< <") =" < < w < < endl;

system("pause");

}