Number of (n+1) X (4+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.
A250808
Number of (n+1) X (4+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) =441a(1) =1731a(2) =6171a(3) =20631a(4) =66291a(5) =207831a(6) =641571a(7) =1961031a(8) =5955891a(9) =18013431a(10) =54331971a(11) =163579431a(12) =491905491a(13) =1478051031a(14) =4438822371a(15) =13325805831a(16) =39996095091a(17) =120025640631a(18) =360151632771
External references
- oeis: A250808