Number of (n+1) X (1+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.
A250870
Number of (n+1) X (1+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) =440a(2) =2002a(3) =8736a(4) =37130a(5) =155080a(6) =640002a(7) =2619056a(8) =10653370a(9) =43144920a(10) =174174002a(11) =701478976a(12) =2820264810a(13) =11324105960a(14) =45425564002a(15) =182089676496a(16) =729520967450
External references
- oeis: A250870