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#18154: skymagic
Accepted: : 2
$$(nm-k)![\frac{x^{k-1}}{(k-1)!}]\prod_{d\in \{n,m\}}\mathcal{B}[(\sum^d_{j\in odd}\frac{\frac{2}{d+1}\cot^2(\frac{\pi j}{2(d+1)})}{1-2\cos(\frac{\pi j}{d+1})x})]$$
#18154: sl1pzz
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#18154: Sleeping_coder
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#18154: sleeping1
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#18154: sllh_dog
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#18154: snow996
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#18154: snowo999
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#18154: snowycat1234
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#18154: Social_Pointer
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#18154: suzhelei
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