a0 = 100

an+1 = G(an,n) where G(x,n) = x-n

what are the first four sequences?

i realize a0=100

and an(a0) +1 = 101

but i do not understand the G(an,n) part or the G(x,n) parts........

can someone explain how i get the answer without telling me, as i want to know how its done...thank you