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Recurrence Relationshard
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If A(x)=∑n=0∞anxn=1(1−x)2A(x) = \sum_{n=0}^{\infty} a_n x^n = \frac{1}{(1-x)^2}A(x)=∑n=0∞​an​xn=(1−x)21​, what is ana_nan​?