
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
Given a sequence $\{a_{n}\}$ where $a_{1}=1$, $a_{2n}=n+1$, $a_{2n+1}=a_{2n}+a_{2n-1}$, $n\in N^{*}$, then the number of elements in the set $\{m|a_{m}\leqslant 20\}$ is ______.

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