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2n
2(1)=2
2(2)=4
2(3)=6
2(15)=30
2(246)=492
2(n-1)+2
2(1-1)+2 =0
2(2-1)+2 = 4
2(3-1)+2 = 6
2(15-1)+2 = 30
2(246-1)+2 = 492