How do you handle experience rewards for a single player who has no followers, hirelings, cohorts, etc, but fully alone? The only thing I could find was a table explaining that if there are 1-3 members in the party, then a 400 xp encounter would give X amount of exp to each member. Would a lone player receive the 400 xp or would they receive the divided amount? Thank you for your help in this matter.
It's entirely possible that I could be wrong, but I think the table you're talking about is designed for the "Abstract XP" method detailed here. If using the "Exact XP" method, you'd simply divide the encounter's XP by the number of PCs(1), assuming I understand it properly.
I generally don't bother with XP and just award levels when appropriate, so it isn't something I've looked at too hard, but that's how I understand it.
I also play a one on one game and although I had intentions of awarding my player in the standard fashion I ended up awarding levels as appropriate as Poldaran.