Number of n X n 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
A206856
Number of n X n 0..2 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =3a(1) =81a(2) =11092a(3) =7598355a(4) =31208037240
External references
- oeis: A206856