For loop summation/ limit

I am trying to write a script that computes (4N^2)/((4N^2)-1) for N = 10, 100, 1000, 10000. Then use the results to estimate the limit. This is the script I have. I know something is wrong because for N=10 the result is 2.0507. Any tips or troubleshooting would be appreaciated

y=2;
N=10;
for i=1:N
    y=y*((4*N^2)/((4*N^2)-1))
end
y

[Star Strider]

What series are you intending to code?

What is the result supposed to be for 10, 100, 1000, 10000 ... ?

[Walter Roberson]

Your title mentions summation, but your code has product ?