Number of zero-sum n X 2 -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.
A201955
Number of zero-sum n X 2 -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.
Terms
- a(0) =7a(1) =231a(2) =1587a(3) =17903a(4) =194633a(5) =2232183a(6) =25952953a(7) =305979795a(8) =3640250461a(9) =43624267941a(10) =525774918227
External references
- oeis: A201955