131782

Appears in sequences

• Expansion of g.f.: ((1 - x - sqrt(1-6*x+5*x^2))/(2*x))^2.at n=9A045868
• Path-counting array T; each step of a path is (1 right) or (1 up) to a point below line y=x, else (1 right and 1 up) or (1 up) to a point on the line y=x, else (1 left) or (1 up) to a point above line y=x. T(i,j)=number of paths to point (i-j,j), for 1<=j<=i, i >= 1.at n=64A055450