Number of nX3 arrays containing 3 copies of 0..n-1 avoiding the pattern down-up in every row and column.
A269504
Number of nX3 arrays containing 3 copies of 0..n-1 avoiding the pattern down-up in every row and column.
Terms
- a(0) =1a(1) =14a(2) =420a(3) =18332a(4) =1261420a(5) =134871120a(6) =21338020496
External references
- oeis: A269504