1445332

Appears in sequences

• a(n)=number of Catalan knight paths in Quadrant I from (0,0) to points on the vertical line x=n. A Catalan knight moves (2 right and 1 up) or (1 right and 1 down).at n=16A096588
• a(n) = 2 * A000538(n).at n=20A259108