find the maximum number of squares in (n*n) grid cheesboard

If there is n*n grid cheesboard
Now find the maximum number of squares possible????

Formula:-

((n*n + n)*(2*n+1))/6 or ((n*(n+1))*(2*n+1))/6

if(n==1) ans=1;
n==2 ans=5;
n==3 ans=14;
n==4 ans=30;