Number of (n+1) X (2+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.
A250871
Number of (n+1) X (2+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) =288a(1) =1456a(2) =6812a(3) =30360a(4) =131068a(5) =553736a(6) =2304492a(7) =9488920a(8) =38773148a(9) =157554216a(10) =637620172a(11) =2572727480a(12) =10357724028a(13) =41631485896a(14) =167128007852a(15) =670318814040
External references
- oeis: A250871