Hi there, I need some help with these questions please:

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Find the first 5 terms of the sequence:

tn=2^tn-1, t1=0 (I think I know this one, I just need some confirmation)

Evaluate each of these expressions:

12!

----

5!3!

9!

---- x21

6!3!

Simplify these expressions:

(nē+5n+6)(n+1)!

and

(n+1)!

------

nē+n

Solve for n:

3n(n!)=60n(n-2)!

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Thanks a lot. Oh, and where I put -----, it means divided by, just in case that wasn't clear. :)