Number of n X n 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal.
A206980
Number of n X n 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal.
Terms
- a(0) =2a(1) =16a(2) =58a(3) =556a(4) =7500a(5) =119224a(6) =2926752a(7) =111202694a(8) =5582239354a(9) =398193149976
External references
- oeis: A206980