Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors equal to 2.
A197055
Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors equal to 2.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =48a(5) =211a(6) =1685a(7) =17107a(8) =194842a(9) =2735810a(10) =54757712a(11) =1541398741a(12) =56647655849
External references
- oeis: A197055