
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 $a_1 + 2a_2 + 2^2a_3 + \cdots + 2^{n-1}a_n = \frac{n}{2}$, $(n\in\mathbb{N}^*)$. Derive the general formula for the sequence $\{a_n\}$.

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