261436domain: NAppears in sequencesTriangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k DUUU's starting at level 1.at n=32A135331The Wiener index of the fullerenyl anion G[n]C[60], defined pictorially in the Arezoomand reference (see Fig. 5).at n=3A221016