Ononot — Solve for a2 if an = a{n-1} + 2a{n-2} with a0 = 1, a1 = 3.

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Recurrence Relationsmedium

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Solve for $a_2$ if $a_n = a_{n-1} + 2a_{n-2}$ with $a_0 = 1, a_1 = 3$ .