If my algorithm has complexity O(n!n), can I just write O(n!), or do I have to keep it like O(n!n)?

문제

Just as I asked in the title: if my algorithm has complexity $O(n!\times n)$, can I just write $O(n!)$, or I have to keep it like $O(n!\times n)$?

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If my algorithm has complexity O(n!*n), can I just write O(n!), or do I have to keep it like O(n!*n)?