Number of (2+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

A250709

Number of (2+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Terms

    a(0) =536a(1) =4958a(2) =37892a(3) =253578a(4) =1578385a(5) =9240474a(6) =52069631a(7) =284450645a(8) =1521706874a(9) =8006080990a(10) =41628131511a(11) =214453424947

External references