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Re:Decomposing a Factorial into Large Factors by madcaptenor on Friday March 28, 2025 @03:45PM (#43509238)
N!! is the usual notation, so 3!! = 3, 4!! = 8, 5!! = 15, 6!! = 48, etc.

It’s a bit unfortunate, because you’d think it meant iterating the factorial, so 3!! = 720, etc. But there are basically no situations where you want to do that.

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