I'm sorry that I don't know the code for sigma notation for the forums but my question is a fairly straight forward one.

I've been give

I would be aseriouspain in the butt to input each number into the equation and add them all up, so I'd like to know if anyone knew the formulas? I have found the formulas.

At this url, and my question is...accoding to the formulas, I start with a negative number? Considering the number without an exponent or variable (-2) is negative.