User blog comment:SuperJedi224/Something I've been putting together/@comment-10429372-20141119195420/@comment-4297047-20141120170145

Well, F(5,1,3,2,1) can be made to represent f[(w^2)*3+w*2+2](5) if you predefine the function up to F(a,b,m,n,o) before hand, though I don't see any way to define it without their being some upper limit to the argument count.