1369377domain: NAppears in sequencesNumerator of Sum_{k=0..2n} (-1)^k/C(2n,k)^3.at n=4A122184Number of (6+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=21A250761