28318137

Appears in sequences

• Number T(n,k) of permutations of {0,1,...,2n} with first element k whose sequence of ascents and descents forms a Dyck path; triangle T(n,k), n>=0, 0<=k<=2n, read by rows.at n=41A316728
• Number of permutations of {0,1,...,2n+2} with first element n whose sequence of ascents and descents forms a Dyck path.at n=5A316730