156033

Appears in sequences

• Small 3-Schroeder numbers: a(n) = A027307(n+1)/2.at n=6A034015
• Length of list created by n substitutions k -> Range( -abs(k+1), abs(k-1), 2) starting with {1}.at n=12A084075
• Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having k u=(2,1) steps among the steps leading to the first d step.at n=28A108440