
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Let the sequence $\{a_n\}$ satisfy $a_{n+1} = 3a_n + 2^n$, ($n \in \mathbb{N}^*$), and $a_1 = 1$, then the general formula for the sequence $\{a_n\}$ is.

Present the answer in LaTex format: \boxed{Your answer}
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