I mean it depends on what exact aspects and to what extent you would want/expect the subjects to be represented. A lot of courses will involve superficial amounts of one and a lot of the other, but there aren't as many that incorporate both in a non-trivial way.
For example, architecture is primarily a design subject and involves a lot of creative design processes and thus is often quite "art-y". There is also usually some maths in the course, but this is typically GCSE standard at most. On the other side of the coin, engineering (particularly mechanical engineering or design/product engineering) might involve some aspects involving aesthetic design but these are usually secondary to the engineering design (which is not a creative design process but an analytical process) involving a lot of maths well beyond A-level.
Your best bet for involving both to non-trivial levels would be design fields with more technical aspects, such as games development/design/programming or product design/engineering. Alternately you may want to explore one side or the other as your formal degree programme while developing your interests in the other side outside of the formal curriculum.