91650domain: NAppears in sequencesa(n) is the smallest number d if the point (d,d) is shared by exactly n different Dyck paths in the main diagonal of the diagram of the symmetries of sigma described in A237593.at n=24A282197Expansion of Sum_{k>=0} x^(3*k) / (1 - k*x)^(k+1).at n=15A360815