1/6 (2 sqrt(3) tan^(-1)((-1 + 2 n)/sqrt(3)) + 2 log(1 + n) - log(1 - n + n^2))1/6 (2 sqrt(3) tan^(-1)((-1 + 2 n)/sqrt(3)) + 2 log(1 + n) - log(1 - n + n^2))

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