
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
A sequence ${a_{n}}$ satisfies $a_{1}=2$, $a_{n+1}= \frac {2(n+2)}{n+1}a_{n}\ (n∈N^{∗})$, find the value of $\frac {a_{2017}}{a_{1}+a_{2}+⋯ +a_{2016}}=$ \_\_\_\_\_\_.

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