
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 the sequence $\{a\_n\}$, where $a\_1=1$, $a\_2=3+5$, $a\_3=7+9+11$, $a\_4=13+15+17+19$, ..., find the value of $a\_{10}$ (answer with a single number).

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