Number of (n+1) X (3+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
A250893
Number of (n+1) X (3+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =403a(1) =1325a(2) =4388a(3) =14196a(4) =44525a(5) =136509a(6) =412006a(7) =1231112a(8) =3657629a(9) =10837431a(10) =32088956a(11) =95066910a(12) =281997715a(13) =837788285a(14) =2492972738a(15) =7429400340a(16) =22170161033a(17) =66233321571a(18) =198057333352a(19) =592697831402
External references
- oeis: A250893