
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
In the arithmetic sequence $\{a_n\}$, $a_2=8$, $S_6=66$  
$(1)$ Find the general formula for the sequence $\{a_n\}$.  
$(2)$ Let $b_n= \frac {2}{(n+1)a_n}$, $T_n=b_1+b_2+b_3+…+b_n$, find $T_n$.

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