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註釋An asymptotic expression for the average height of a planted plane tree is derived, based on an asymptotic series for sums such as the Summation (k> or = 1) of (2n, N + K) d(k) and the Summation (k> or = 1) of (e to the ( -k squared/n) power) d(k), where d(n) is the number of divisors of n. (Author)