Every time I come home from grocery shopping and unload all the groceries, I have a bunch of empty plastic bags to take to recycling. So I take one bag and stuff the rest into it. But there is more than one way to accomplish this. For example, if I had three bags, I could stuff one into a second one, then stuff that one into the third. Or, I could just stuff two of them into the third without either one being inside the other. (The bags are indistinguishable.) So there are two ways I could stuff three bags.
How many ways could I stuff 10 bags?