2 x 1 - 2, 2 x 2 - 2 + 2 = 4, 2 x 3 - 2 + 2 + 2 = 6, 2 x 4 - 2 + 2 + 2 + 2 = 8, 2 x 5 - 10, 2 x 6 - 12, 2 x 7 - 14, 2 x 8 - 16, 2 x 9 - 18, 2 x 10 - 20,

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