The formula of 1 / 2,5 / 6,23 / 24119 / 120719 / 720 What if it can't be expressed as a factorial? What should I do?

If you've learned factorial, I'll write it directly
（n!-1）/n!
If not, use [n (n-1) (n-2) 2*1-1]/[n(n-1)(n-2)…… 2*1]
But this one is longer

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