Number of n X 2 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.

A233141

Number of n X 2 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.

Terms

    a(0) =2a(1) =16a(2) =225a(3) =3727a(4) =65120a(5) =1158334a(6) =20726079a(7) =371568349a(8) =6665506622a(9) =119595908140

External references