You'll have a number of choices, here's one . . . https://is.lsu.edu/courselist.asp?cat=Mathematics&nid=102&pg=
What kind of math class? There are tons of online college level math classes, from "Business Math" to "Advanced Calculus." What are you trying to accomplish?
University of North Dakota's math courses are pretty easy to sign up. Just follow the online submission and declare that you've got credits elsewhere. their registrar don't even bother to check or ask you to request to see your transcripts. I've signed up for Calculus I without doing college algebra. :X
I had the same thought but I figured that the only courses without pre-requisites would be a basic algebra type of course.