
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 $a_1=2$, $$\frac {a_{n+1}}{n+1}$$- $$\frac {a_{n}}{n}$$=2, if $b_n=2^{\sqrt {2a_{n}}}$, then the sum of the first n terms of the sequence $\{b_n\}$, denoted as $S_n$, equals to ___.

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