Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303248
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =3a(2) =49a(3) =1401a(4) =106803a(5) =19457754a(6) =7600681910
External references
- oeis: A303248