When $i = 1$, we have $1^2 - 2(1) = 1 - 2 = -1$.
When $i = 2$, we have $2^2 - 2(2) = 4 - 4 = 0$.
When $i = 3$, we have $3^2 - 2(3) = 9 - 6 = 3$.
When $i = 4$, we have $4^2 - 2(4) = 16 - 8 = 8$.
When $i = 5$, we have $5^2 - 2(5) = 25 - 10 = 15$.
Now, let's add up
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