Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
A301609
Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =3a(2) =62a(3) =3816a(4) =758338a(5) =488491106
External references
- oeis: A301609