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.
A250749
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) =72a(1) =237a(2) =756a(3) =2361a(4) =7272a(5) =22197a(6) =67356a(7) =203601a(8) =613872a(9) =1847757a(10) =5555556a(11) =16691241a(12) =50122872a(13) =150466917a(14) =451597356a(15) =1355185281a(16) =4066342272a(17) =12200599677a(18) =36604944756a(19) =109821125721a(20) =329475960072a(21) =988453046037
External references
- oeis: A250749