While we don't filter applications just because they have a single founder, it does make things more difficult for the selection process. The question we ask is, and for your sake as well: do you have all the skills your company needs to succeed?
We look for great, balanced teams who have a full range of skills. We strongly advise you to seek co-founders who balance your skillset. For example, if you're a strong developer, you might consider adding someone with business and/or marketing experience. If you're a great business evangelist with no developer, it's very unlikely we'll accept you into the program, so go find a rock star developer to join you! We hope you find your team and tribe, as the startup journey can be quite the challenge.