Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1s.

A297655

Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1s.

Terms

    a(0) =1a(1) =10a(2) =43a(3) =140a(4) =494a(5) =1845a(6) =6757a(7) =24479a(8) =89068a(9) =324765a(10) =1182996a(11) =4307440a(12) =15687513a(13) =57137761a(14) =208098949a(15) =757896766a(16) =2760293603a(17) =10053139616a(18) =36613986582a(19) =133349718469a(20) =485665707449

External references