What is the nth term of -2 -8 -18 -32 - 50?

What is the nth term of -2 -8 -18 -32 - 50?
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The nth term is 2n2. (One way to find that is to notice at all the numbers are even, then divide them by 2. The sequence becomes 1, 4, 9, 16, 25, which are the square numbers in order.)
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