1,4,10,28,?,244

1,4,10,28,?,244

$$3^n + 1 - \left\{ \ \dfrac{ 1- \left[\ 1 \mod (n+1) \right \ ] } {n+1}\ \right\}$$

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1,4,10,28,?,244

 I am going for     $$3^n+1$$