Number of zero-sum n X 4 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor.
A201843
Number of zero-sum n X 4 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =3a(1) =97a(2) =2019a(3) =54773a(4) =1566319a(5) =47249907a(6) =1459651671a(7) =45844870481
External references
- oeis: A201843