Number of zero-sum nX2 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor.
A201885
Number of zero-sum nX2 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =1a(1) =9a(2) =63a(3) =413a(4) =3293a(5) =25123a(6) =196811a(7) =1610765a(8) =13183301a(9) =109772649a(10) =924269015a(11) =7845330131a(12) =67157103399a(13) =578601709251
External references
- oeis: A201885