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SUBMIT YOUR IDEAMy Solution:
Macro's are always a bit tricky to me!!
Had a lot of fun solving this though.
First challenge on macro, to actually train me on this topic :)
I'm using drop down tool to select the filed to calculate on, then use action too to replace the field name with the selected one.
First I'm generating rows according to the values in the selected column, then I'm using Multi-row formula to calculate the factorial factorial sequence, then a summarize tool to group by selected column and max of facorial :