
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 sum of the first $n$ terms of an arithmetic sequence $\{a_n\}$ is $S_n= \frac {n^2+3n}{2}$.  
(I) Find the general formula for the sequence $\{a_n\}$.  
(II) If the sequence $\{b_n\}$ satisfies $b_n= \frac {1}{a_{2n-1}a_{2n+1}}$, find the sum of the first $n$ terms of the sequence $\{b_n\}$, $T_n$.

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