You can go to the school’s web site and look up its catalogs, schedules, and faculty rosters as a starting point.
I don’t think any of these schools are need blind for internationals for admissions. So if you need a lot of aid, your chances of admission are lower. Also, not all of them meet need even if the student is admitted – Bard and Lafayette, for example.
Seconding the recommendation by @merc81 of St. Olaf. Very strong math program on the Hill. http://wp.stolaf.edu/math/
They also administer the Budapest Semesters in Mathematics study abroad program.
http://www.budapestsemesters.com/
^^ Only a few colleges are need-blind and also claim to meet full need for internationals:
Harvard, Princeton, Yale, MIT, Amherst.
All are extremely selective.