Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.
A297597
Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.
Terms
- a(0) =1a(1) =20a(2) =69a(3) =154a(4) =752a(5) =3145a(6) =10131a(7) =37929a(8) =150388a(9) =546267a(10) =2000770a(11) =7586016a(12) =28281649a(13) =104554687a(14) =390572927a(15) =1458526512a(16) =5423019339a(17) =20199712660a(18) =75329388620a(19) =280578366045
External references
- oeis: A297597