Chatelet Station

My daughter's never-go had been found and was being held at lost property in this place called Chatelet. I kind of felt like, what if H.G. Wells had visited Chatelet Station? How would he have described it in one of his stories? It is a subterranean citadel full of evil spells and sinister magic. The place is inscribed with confusing symbols and numbers all pointing in different directions. There are numbers which appear quite randomly. One, four, seven, fourteen. What is the solution to this maths puzzle?