Number of nX2 arrays containing 2 copies of 0..n-1 avoiding the pattern down-up in every row and equal-up in every column.
A269477
Number of nX2 arrays containing 2 copies of 0..n-1 avoiding the pattern down-up in every row and equal-up in every column.
Terms
- a(0) =1a(1) =6a(2) =54a(3) =600a(4) =9102a(5) =188472a(6) =5118012a(7) =172101936a(8) =6887210886a(9) =321643938456
External references
- oeis: A269477