Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1's.
A297425
Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1's.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =42a(4) =535a(5) =11345a(6) =431723a(7) =28588498a(8) =3362921639a(9) =861591734557
External references
- oeis: A297425