
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 H1N1 influenza virus is a parasite that lives inside the host's cells. If there are initially 2 cells, denoted as $a=2$, they divide according to the following rule: after 1 hour, they divide into 4 cells and 1 dies, after 2 hours, they divide into 6 cells and 1 dies, after 3 hours, they divide into 10 cells and 1 dies, ..., let the number of cells after $n$ hours be $a_n$, then $a_n=$ （expressed in terms of $n$）.

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