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

A297585

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

Terms

    a(0) =1a(1) =20a(2) =102a(3) =254a(4) =1017a(5) =5263a(6) =20771a(7) =76340a(8) =320326a(9) =1353690a(10) =5389975a(11) =21589173a(12) =88747475a(13) =362176212a(14) =1462891858a(15) =5938102840a(16) =24195113809a(17) =98303450371a(18) =398918472477

External references