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 x(i,j)-x(i-1,j) in the j direction.
A250522
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 x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =867a(1) =5029a(2) =21955a(3) =82023a(4) =279161a(5) =896191a(6) =2771901a(7) =8374485a(8) =24944039a(9) =73714737a(10) =217061167a(11) =638657339a(12) =1880873517a(13) =5549684027a(14) =16412416857a(15) =48651910233a(16) =144539853387a(17) =430255351197
External references
- oeis: A250522