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Recurrence Relationseasy
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Which closed-form solution satisfies the recurrence an=2an−1−an−2a_n = 2a_{n-1} - a_{n-2}an​=2an−1​−an−2​ with initial conditions a0=0a_0 = 0a0​=0 and a1=1a_1 = 1a1​=1?