Number of (n+1) X (6+1) 0..3 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.

A250875

Number of (n+1) X (6+1) 0..3 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.

Terms

    a(0) =3680a(1) =18520a(2) =88212a(3) =400496a(4) =1755220a(5) =7500960a(6) =31484612a(7) =130461616a(8) =535577460a(9) =2183825600a(10) =8860495012a(11) =35818848336a(12) =144408578900a(13) =581039033440

External references