
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
The sequence $\{a_n\}$ consists of positive numbers, and $S_n$ is the sum of its first $n$ terms. For any $n \in \mathbf{N}^*$, $2a_n$, $2S_n$, and $a_n^2$ form an arithmetic sequence. The general formula for $\{a_n\}$ is ______________.

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