
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 ${a_n}$ satisfies $a_1=1$, and for any $m, n \in \mathbb{N}^*$, $a_{m+n}=a_m+a_n+mn$, find the value of $\frac{1}{a_1} + \frac{1}{a_2} + \ldots + \frac{1}{a_{2018}}$.

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