Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero.
A231949
Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero.
Terms
- a(0) =4a(1) =142a(2) =14842a(3) =6517534a(4) =11501370840
External references
- oeis: A231949