Question: Let ( a n ) be a sequence such that a 1 : = 1 , a 2 : = 5 and a n 1

Let (an) be a sequence such that a1:=1,a2:=5 and an1:=2an-1an for all n2. Show that for all natural numbers n,
an=2n(-1)n
Let ( a n ) be a sequence such that a 1 : = 1 , a

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