Proof 13.2: Let $s(n, k)$ denote the signless Stirling numbers of the first kind. Using the recursive formula $s(n, k) = s(n - 1, k - 1) + (n - 1)s(n - 1, k)$, prove that $s(n, 2) = (n - 1)! \left(1 + \frac{1}{2} + \frac{1}{3} + \dots + \frac{1}{n - 1} \right)$.
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