Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318009
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =8a(2) =118a(3) =3062a(4) =133136a(5) =10674882a(6) =1493271874a(7) =372575745070
External references
- oeis: A318009