20W, 18Y, 16Br, 14R, 12G, 10Bl.
Losing one or two shouldn't be too much of an issue though. The more experienced players become, the less beans are used (or at least should be).
Thanks, TC. Yeah, I figured loosing one (or two of the lower value beans) wouldn't make a big difference in game terms. Still, my OCD sensibilities are such that not knowing how many there should even be was kind of bugging me.
You might also consider adding that to the rule book if you ever get an opportunity to reprint it. If I were in your position I'd also consider throwing in a few extras along with set-up text specifying how many of each to start with. The beans are quite small and many of them are fairly neutral colored and tend to match many common flooring colors - if one ever hit the floor it would be very difficult to find it by chance. Being able to do an accurate count at break down will go a long way to keeping the game complete.