數列 langle a n rangle 滿足 a 1=2 ， a n+1 =3a n+1 ，求 a 5 。

數列 $⟨ a_{n} ⟩$ 滿足 $a_{1} = 2$ ， $a_{n + 1} = 3 a_{n} + 1$ ，求 $a_{5}$ 。

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