Number of (n+1)X(1+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

A250529

Number of (n+1)X(1+1) 0..3 arrays with nondecreasing max(x(i,j),x(i,j-1)) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Terms

    a(0) =110a(1) =700a(2) =3958a(3) =21326a(4) =110546a(5) =559824a(6) =2787971a(7) =13727380a(8) =67045240a(9) =325579124a(10) =1574538204a(11) =7592038724a(12) =36528105991a(13) =175474939818a(14) =841989538667

External references