Number of paths from (0,0) to (n,n) that use E(1,0) and N(0,1) as steps and have odd number of East steps below the line y=x-1.

A268214

Number of paths from (0,0) to (n,n) that use E(1,0) and N(0,1) as steps and have odd number of East steps below the line y=x-1.