Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors equal to itself.
A195963
Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors equal to itself.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =21a(4) =193a(5) =746a(6) =13302a(7) =230806a(8) =8567404a(9) =292294619
External references
- oeis: A195963