4294290

Appears in sequences

• Number of walks on square lattice. Column y=1 of A052174.at n=13A005559
• Row 1 of table in A067640.at n=6A067636
• Table T(n,k) giving number of two-legged knot diagrams with n >= 0 self-intersections and k >= 0 tangencies, read by antidiagonals.at n=34A067640