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 min(x(i,j),x(i-1,j)) in the j direction.

A250807

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 min(x(i,j),x(i-1,j)) in the j direction.

Terms

    a(0) =225a(1) =873a(2) =3081a(3) =10233a(4) =32745a(5) =102393a(6) =315561a(7) =963513a(8) =2924265a(9) =8840313a(10) =26656041a(11) =80238393a(12) =241255785a(13) =724848633a(14) =2176708521a(15) =6534450873a(16) =19612003305a(17) =58853311353a(18) =176594537001a(19) =529852816953

External references