
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 arrangement of a number array is as follows:  
1   2   4   7   11  16  22…  
3   5   8   12  17  23…  
6   9   13  18  24…  
10  14  19  25…  
15  20  26…  
21  27…  
28…  
What is the 10th number from left to right in the 20th row?

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