Question: How do I use recursion and get Maple fast?

I have the next problem, i need to  use recursion to make the equation E(x+1)=E(x)+(E(x)*(P-E(x)))/P*10 with P 15000 and E(1)=1, i put for example E(20), but maple only use ram, but doesn't do anything.

 

Thanks

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