Quadratic Sequences Watch

Pikemonster1
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What is the nth term of 3,9,17,27,39,53? I've sold loads of quadratic sequences before this but this doesn't make any sense to me.
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NotNotBatman
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If you list the difference between the square of each term with it's corresponding value, then each successive term is 3 more than the last, multiply that by n. And find the term that would come before it, the 0th term and add it to n^2.
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