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Compute the sum of first n terms of 1 + (1 + 4) + (1 + 4 + 4^2) + (1 + 4 + 4^2 + 4^3) + …

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Compute the sum of first n terms of 1 + (1 + 4) + (1 + 4 + 42) + (1 + 4 + 42 + 43) + …

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= (4/9)(4n - 1) - (n/3)

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