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For each sequence, find a closed formula for the general term, $a_n$ .

1. $-59, -56, -53, -50, -47, \ldots, a_n =$ .

2. $-2, -8, -18, -32, -50, \ldots, a_n =$ .

3. $-63, -567, -5103, -45927, -413343, \ldots, a_n =$ .

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