Link 1: https://www.mathworks.com/help/symbolic/symsum.html#:~:text=For%20example%2C%20find%20the%20sum,1%208%20k%20x%20k%20.&text=Calculate%20the%20summation%20series%20for%20x%20%3D%202%20.&text=Alternatively%2C%20if%20you%20know%20that,%3D%201%20%2C%20%E2%80%A6%20%2C%208%20.
Link 2: https://www.mathworks.com/matlabcentral/answers/392707-how-to-write-summation-with-limits