Number of n X n 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.
A269102
Number of n X n 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.
Terms
- a(0) =4a(1) =180a(2) =40908a(3) =43964700a(4) =232068730044
External references
- oeis: A269102