Question

this are I_1 I_2 recurrence formulas

I_1 = ∫xe^xdx

I_1= xe^x-1. I_0 = xe^x-e^x

I_2= ∫x^2 e^xdx

I_2 = x^2e^x-2I_2-1=x^2e^x-2I_1=x^2e^2-2(xe^x-e^x)=e^x(x^2-2x+2)

i need formulas

I_3= ?

I_4= ?

I_5= ?

thank you