Number of (n+1)X(n+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.

A250869

Number of (n+1)X(n+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) =90a(1) =1456a(2) =16262a(3) =144248a(4) =1097986a(5) =7500960a(6) =47315662a(7) =280898512a(8) =1590567658a(9) =8673625464a(10) =45876777622a(11) =236629296200

External references