Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
A301778
Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =8a(2) =240a(3) =25872a(4) =10033408a(5) =14004742144
External references
- oeis: A301778