https://math.stackexchange.com/questions/557230/ordinary-generating-function-for-binom3nn
https://math.stackexchange.com/questions/774434/generating-function-of-binom3nn?noredirect=1
posted on 2023-07-22 22:34 Eufisky 阅读(31) 评论(0) 编辑 收藏 举报
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