i need to calculate the limit of this sequence:

i tried to use the sandwich rule to squeeze it between to sequences, but got stuck.

this is what i did so far:

but i couldn't find anything smaller then the given sequence that can be easily calculated.

for example, i know that:

and i know that , but is it enough to say that if then also ?

thanks in advanced!!!

BTW, if there's any other way to get to the answer ( ) i'd love to hear.