@VaporeonKid, Swartrhmore seems like a great fit given its an LAC that’s incredibly strong in Math and with the consortium you can take classes at Penn. Another great choice would be Carnegie Mellon because while a university its relatively small so will have more of a LAC feel. Also, Wesleyan would be great true LAC choice even though it has a small graduate school, although I don’t know if the classes are available to undergraduate students. In addition, would throw Harvey Mudd in as well as it has a great math program with very robust course offerings.