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

A250872

Number of (n+1) X (3+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) =678a(1) =3442a(2) =16262a(3) =73122a(4) =317878a(5) =1350002a(6) =5640102a(7) =23289922a(8) =95366678a(9) =388124562a(10) =1572545542a(11) =6350471522a(12) =25583049078a(13) =102876275122a(14) =413138516582

External references