$$7$$ friends $$A$$, $$B$$, $$C$$, $$D$$, $$E$$, $$F$$ and $$G$$ went for dinner together. In the restaurant, there was a round table with $$7$$ chairs labelled with each of their names. They entered the restaurant in a random order. Each person will always choose not to sit on their own chair where possible. How many different possible ways of seating are there?~\uline{~~~~~~~~~~}~ 
Overseas Competition->Knowledge Point->Calculation Modules->Comparing, Ordering and Estimating