Compute an arithmetic series in calc?

If I want to compute the value of a series, how would I do that?

Specifically, I’d like to calculate the sum x*2^(x-1) where x goes from 1 to n (incrementing by 1). Is there a way to do this without having a column or row that just tracks each term in the series?

Why was this closed? People still need to compute arithmetic series in calc, so how is it outdated?