Formula Coding for Factorials

[alouie457]

I need to write a formula or a function that divides all the numbers from the previous year without having to input it manually.
For example,
Year 1 1 20
Year 2 2 30
Year 3 3 40
Year 4 4 50

So I need 20/1 , 30/(1*2), 40/(1*2*3), 50/(1*2*3*4).

I have about 400 cells that I need to do so I can't input it manually. Is there a function i can use to solve this problem.

For those that know finance, I am try to discount cash flows where each year has a different interest.

Thanks for any help.