Number of nX5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row, with rows in lexicographically nondecreasing order.
A222157
Number of nX5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row, with rows in lexicographically nondecreasing order.
Terms
- a(0) =120a(1) =6322a(2) =207262a(3) =4907711a(4) =91075868a(5) =1393742886a(6) =18203084280a(7) =207961261268
External references
- oeis: A222157