Ononot — Let an = \sum{i=1}^{n-1} i \cdot ai for n \geq 2 with a1 = 1

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Let $a_n = \sum_{i=1}^{n-1} i \cdot a_i$ for $n \geq 2$ with $a_1 = 1$ . Find the value of $a_4$ .