Number of (n+1) X (7+1) 0..2 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.
A250754
Number of (n+1) X (7+1) 0..2 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) =527a(1) =1707a(2) =5471a(3) =17211a(4) =53327a(5) =163467a(6) =497471a(7) =1506651a(8) =4548527a(9) =13702827a(10) =41223071a(11) =123898491a(12) =372154127a(13) =1117379787a(14) =3353974271a(15) =10065592731a(16) =30204118127a(17) =90627034347a(18) =271910463071a(19) =815790109371
External references
- oeis: A250754