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(e^(1/n)-1) (n/sqrt(n^2+4)-(2 n+1)/(2 sqrt(n (n+1))))+(e^(1/n) (sqrt(n (n+1))-sqrt(n^2+4)))/n^2
(e^(1/n)-1) (n/sqrt(n^2+4)-(2 n+1)/(2 sqrt(n (n+1))))+(e^(1/n) (sqrt(n (n+1))-sqrt(n^2+4)))/n^2
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