Number of zero-sum n X n -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.
A202040
Number of zero-sum n X n -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =19a(2) =415a(3) =31753a(4) =6221993a(5) =3573771563
External references
- oeis: A202040