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'!@&~-.*Aux*.-~&@!'
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#353: skymagic
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$$(nm-k)![\frac{x^{k-1}}{(k-1)!}]\prod_{d\in \{n,m\}}\mathcal{B}[(\sum^d_{j\in odd}\frac{\frac{2}{d+1}\cot^2(\frac{\pi j}{2(d+1)})}{1-2\cos(\frac{\pi j}{d+1})x})]$$
#353: SkyMaths
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古今多少事，都付笑谈中
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O Fortuna velut luna statu varialilis……
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未来始终都掌握在我们手中，从指间漏下的我们称之为过去
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