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Recursionmedium
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A recursive sequence is defined as an=an−1+3n2−3n+1a_n = a_{n-1} + 3n^2 - 3n + 1an​=an−1​+3n2−3n+1 with a0=0a_0 = 0a0​=0. Which closed-form formula correctly describes ana_nan​?