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Recursioneasy
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A recursive sequence is defined by an=an−1+3n+1a_n = a_{n-1} + 3n + 1an​=an−1​+3n+1 for n≥1n \ge 1n≥1, with a0=0a_0 = 0a0​=0. What is the value of a2a_2a2​?