Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303405
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =3a(2) =28a(3) =168a(4) =4013a(5) =236326a(6) =24386918a(7) =4298730424
External references
- oeis: A303405