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.

A250750

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) =129a(1) =423a(2) =1353a(3) =4239a(4) =13089a(5) =40023a(6) =121593a(7) =367839a(8) =1109649a(9) =3341223a(10) =10048233a(11) =30193839a(12) =90679809a(13) =272236023a(14) =817101273a(15) =2452090239a(16) =7357843569a(17) =22076676423a(18) =66236320713a(19) =198721545039a(20) =596189800929

External references