Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318030
Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =69a(4) =580a(5) =7728a(6) =204645a(7) =10928383a(8) =1157058721a(9) =226601121228
External references
- oeis: A318030