Number of nX3 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

A297728

Number of nX3 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

Terms

    a(0) =1a(1) =8a(2) =17a(3) =39a(4) =151a(5) =385a(6) =1026a(7) =3272a(8) =8945a(9) =24901a(10) =74075a(11) =208094a(12) =588488a(13) =1706080a(14) =4842007a(15) =13774525a(16) =39552499a(17) =112678747a(18) =321268652a(19) =919208426a(20) =2622325086a(21) =7483126614a(22) =21382095851a(23) =61030208100a(24) =174213589553a(25) =497546313443

External references