Having a lousy memory, it made me think that maybe I'd missed one - but at the same time, I really can't answer the question. Let me explain.
I pick on a story I want to serialize, Copy it. Split the copy into a number of sections - usually six to eight and re-name it as a new file. Put in some identification as to which part is what, then copy an 'ending' para. Weekly then, I simply cut the first part from the story, then paste it onto the post I'm making. When that re-named file is empty, I've sent in all the story - so I've no real memory of how many parts I make a story into.
But? Knowing me? I can honestly say that it's entirely possible that I screw up and forget to actually paste that weeks episode.
So? For goodness sake, if there's a part of a serial missing? Please let me know immediately and I'll fix it.