#include <bits/stdc++.h>
using namespace std;
int main()
{
long long int n,i,j,t,ss,sn,d;
cin>>t;
for(i=1;i<=t;i++)
{
cin>>n;
sn=(n*(n+1))/2;
ss=(n*(n+1)*(2*n+1))/6;
d=abs(ss-(sn*sn));
cout<<d<<endl;
}
return 0;
}
DevSkill DCP 154 Square Sum Difference
#include <bits/stdc++.h>
using namespace std;
int main()
{
long long int n,i,j,t,ss,sn,d;
cin>>t;
for(i=1;i<=t;i++)
{
cin>>n;
sn=(n*(n+1))/2;
ss=(n*(n+1)*(2*n+1))/6;
d=abs(ss-(sn*sn));
cout<<d<<endl;
}
return 0;
}
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