That is definitely an oddball size, but those are often the most fun. Obviously, you're going to have to do multiple smaller bulbs in series to cover this tank with light.
I see three potential configurations for this tank (two of which I like most).
1) Four 24" F17T8 bulbs Like these:
UFL - F17T8
Configure two bulbs in series with a 4-F32T8 ballast. The total effect should be roughly equal to two ODNO four foot tubes (13000 lumens) which is just over 2 watts per gallon with pretty good dispersion.
2) Three or four three foot bulbs, overhanging the tank three inches on each side. Aside from being slightly unsightly, this setup is pretty ideal for plants, lighting to the very edge and even side-lighting a bit. Downside is that you'll need three or four ballasts, which would drive cost up close to a PC setup.
3) Another possibility is just like the last option, but instead of 36" bulbs, use two 15" bulbs in series for each ballast. I'm using a pair of these bulbs on my 20g reef and the light is pretty impressive. Coraline algae is growing prolifically. This would also keep all the bulbs within a canopy and prevent overhand. Once again, though, you'd have to spring for at least three ballasts to get enough light. You'd end up with a total of six bulbs as well, so it would be a good idea to buy a case of these bulbs right up front. Another plus for this config is that you could align the bulbs either three rows of two, lengthwise, or six rows of one along the tank. Either way, you're going to pretty much gaurantee no dark corners or shadows!
Hope that helps!