Number of (4+1) X (n+1) 0..1 arrays with nondecreasing min(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.
A250801
Number of (4+1) X (n+1) 0..1 arrays with nondecreasing min(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) =140a(1) =490a(2) =1430a(3) =3776a(4) =9258a(5) =21610a(6) =48600a(7) =106426a(8) =228342a(9) =482496a(10) =1007546a(11) =2084962a(12) =4284032a(13) =8754018a(14) =17810278a(15) =36111264a(16) =73018218a(17) =147325946a(18) =296740456a(19) =596862762a(20) =1199199990a(21) =2407260800a(22) =4828861690a(23) =9680929586a(24) =19399411088
External references
- oeis: A250801