The $F$-triangle of the generalised cluster complex

The $F$-triangle is a refined face count for the generalised cluster complex of Fomin and Reading. We compute the $F$-triangle explicitly for all irreducible finite root systems. Furthermore, we use these results to partially prove the “$M=F$ Conjecture” of Armstrong which predicts a surprising relation between the $F$-triangle and the M"obius function of his $m$-divisible partition poset associated to a finite root system.