Computing same monthly payment

Month = (1:n)';
Monthly_Amount(60,1)=(P*i/(1-(1+i)^-n))

This is part of a code to create a monthly payment. My question is that i need to computed the monthly in amount which is the same for 60 monts. Now i need to create a vector for this amount to be shown in table

when i tried it this way the output was zeros from 1-59th month and the correct amount in the 60th month.

Since it doesn't change monthly i opted to noit enter it in my for loop.

Not sure if i explained myself well.