QOJ.ac
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#-3081: apnet
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#-3081: apocryphal
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$$\prod_{n=1}^{\infty}\frac{1}{1-x^n}=\sum_{n=0}^{\infty}x^{n^2}\left(\prod_{m=1}^n\frac{1}{1-x^m}\right)^2$$
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