Number of 4Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row.
A221626
Number of 4Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row.
Terms
- a(0) =1a(1) =5a(2) =453a(3) =85035a(4) =51149685a(5) =57614883627
External references
- oeis: A221626