I am currently a student at a small liberal arts college which does not offer the courses that would make me more competitive as an applicant to Master's or PhD programs in Mathematics.
Since I am ready to move on, my first thought was to continue as a visiting (non-matriculated) student after graduation at a different university for one or two semesters before applying to programs.
It seems however, that few of the top universities have visiting students programs and most of the ones I've seen are geared toward undergraduates looking to go on exchange.
Does anyone know of programs aimed for people in my situation? Is it common? On NYU courant's site, for instance, they offer the non-degree option, but the major disadvantage is cost of living and lack of campus.