Number of n X n 1..n arrays with row and column sums n(n+1)/2 and no two adjacent elements equal.
A176391
Number of n X n 1..n arrays with row and column sums n(n+1)/2 and no two adjacent elements equal.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =1396a(4) =5147608
External references
- oeis: A176391