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Recursioneasy
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A sequence ana_nan​ is defined by an=an−1+(n−1)2a_n = a_{n-1} + (n-1)^2an​=an−1​+(n−1)2 for n≥1n \ge 1n≥1, with a0=0a_0 = 0a0​=0. What is a2a_2a2​?