Overanalysing the 348 teams to have appeared in the European Cup after Real Madrid's 500th game

Which countries have been represented? Which haven't? Who made the final in their only appearance? Why are Arges Pitesti special?

Overanalysing the 348 teams to have appeared in the European Cup after Real Madrid's 500th game
Which countries have been represented? Which haven't? Who made the final in their only appearance? Why are Arges Pitesti special?