Number of n X 4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

A297391

Number of n X 4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

Terms

    a(0) =4a(1) =13a(2) =37a(3) =126a(4) =385a(5) =1243a(6) =3924a(7) =12477a(8) =39625a(9) =125780a(10) =399527a(11) =1268481a(12) =4028320a(13) =12791471a(14) =40619227a(15) =128985178a(16) =409588149a(17) =1300636903a(18) =4130132236a(19) =13115120227a(20) =41646681705a(21) =132247843570a(22) =419949219621

External references