Ononot — For the recurrence an = 4a{n-1} - 4a{n-2} with a0 = 1 and a1

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Recurrence Relationshard

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For the recurrence $a_n = 4a_{n-1} - 4a_{n-2}$ with $a_0 = 1$ and $a_1 = 3$ , what is $a_4$ ?