Factorization and catenary degree in 3-generated numerical semigroups

Given a numerical semigroup S(A), generated by A = {a,b,N} ⊂ N with 0 < a < b < N and gcd(a,b,N) = 1, we give a parameterization of the set F(m;A) = {(x, y, z) ∈ $N^3$ | xa + yb + zN = m} for any m ∈ S(A). We also give the catenary degree of S(A), c(A). Boths results need the computation of an L-shaped tile, related to the set A, that has time-complexity O(logN) in the worst case