Number of (n+1) X (2+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.

A250847

Number of (n+1) X (2+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) =400a(1) =2457a(2) =13097a(3) =63631a(4) =291165a(5) =1280447a(6) =5480917a(7) =23024631a(8) =95448605a(9) =391939087a(10) =1598379237a(11) =6485763431a(12) =26220548845a(13) =105716192127a(14) =425369781557

External references