Number of zero-sum n X n -1..1 arrays with every element equal to at least one horizontal or vertical neighbor.
A201839
Number of zero-sum n X n -1..1 arrays with every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =0a(1) =5a(2) =125a(3) =54773a(4) =109797321
External references
- oeis: A201839