Number of (n+1)X(3+1) 0..3 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.

A250702

Number of (n+1)X(3+1) 0..3 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) =3674a(1) =37892a(2) =301632a(3) =2003383a(4) =11250902a(5) =55337801a(6) =242456834a(7) =965170215a(8) =3536263608a(9) =12071431807a(10) =38742802226a(11) =117849554654a(12) =341936089415a(13) =951596515026

External references