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 nonincreasing order.
A222003
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 nonincreasing order.
Terms
- a(0) =120a(1) =3853a(2) =78376a(3) =1227685a(4) =16011558a(5) =180224522a(6) =1788225862a(7) =15883318341a(8) =127864299298a(9) =942615276569
External references
- oeis: A222003