Y Combinator has funded lot of single founder compnies. So, Y Combinator seems like it might be the Y Combinator for single founder companies.

pg has said it's a negative, and it really is. The likelihood of a single founder company growing huge is smaller than if there's small team at the start, for all sorts of reasons (which pg and others have written about). But, if you've built something awesome, YC isn't going to say no just because you're a solo founder.