Number of (n+1) X (2+1) 0..2 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.

A250806

Number of (n+1) X (2+1) 0..2 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) =100a(1) =379a(2) =1315a(3) =4321a(4) =13735a(5) =42769a(6) =131455a(7) =400681a(8) =1214695a(9) =3669409a(10) =11058895a(11) =33278041a(12) =100036855a(13) =300516049a(14) =902359135a(15) =2708699401a(16) =8129342215a(17) =24394514689a(18) =73196520175a(19) =219615512761a(20) =658898442775

External references