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Examples:
1. Find a formula for the nth term of the sequence 2, 8, 18, 32,...
3 4 5
2. Find the general term for the sequence 2, 8' 27'14
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3. Find the nth term of a sequence whose first several terms are given
1 3 5 7
2'4'6'8
4. Find the nth term of a sequence whose first several terms are given
-2, 4, -8, 16, -32,...