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 x(i,j)-x(i-1,j) in the j direction.
A250521
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 x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =222a(1) =1180a(2) =5029a(3) =18859a(4) =65310a(5) =214812a(6) =682921a(7) =2122743a(8) =6501118a(9) =19720580a(10) =59462069a(11) =178644459a(12) =535616774a(13) =1604254580a(14) =4803055177a(15) =14379531399a(16) =43056528118a(17) =128955131820a(18) =386326404261
External references
- oeis: A250521