Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.
A207311
Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.
Terms
- a(0) =3a(1) =81a(2) =15390a(3) =21162579a(4) =205235353935
External references
- oeis: A207311