Number of zero-sum nX2 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor.
A201841
Number of zero-sum nX2 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =1a(1) =5a(2) =25a(3) =97a(4) =411a(5) =1897a(6) =8741a(7) =41689a(8) =201985a(9) =987407a(10) =4891069a(11) =24457873a(12) =123131033a(13) =623695509a(14) =3174983801a(15) =16227954653a(16) =83226630287a(17) =428047598133
External references
- oeis: A201841