Number of nX3 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
A206858
Number of nX3 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =25a(1) =625a(2) =11092a(3) =192575a(4) =3425501a(5) =61164640a(6) =1090023439a(7) =19411973287a(8) =345764258689
External references
- oeis: A206858