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Recurrence Relationshard
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Given an=2an−1−2an−2a_n = 2a_{n-1} - 2a_{n-2}an​=2an−1​−2an−2​ with a0=0,a1=1a_0=0, a_1=1a0​=0,a1​=1, what is a4a_4a4​?