a(n)/n! is the expected number of left-to-right maxima in the lexicographical or colexicographical ordering of all the 2-subsets of [n] under a random permutation of [n], when the 2-subsets hold the worst order of ranks.
A308729
a(n)/n! is the expected number of left-to-right maxima in the lexicographical or colexicographical ordering of all the 2-subsets of [n] under a random permutation of [n], when the 2-subsets hold the worst order of ranks.
Terms
- a(0) =0a(1) =2a(2) =11a(3) =61a(4) =379a(5) =2668a(6) =21160a(7) =187388a(8) =1836396a(9) =19753416a(10) =231545016a(11) =2939000832a(12) =40172455296a(13) =588444153984
External references
- oeis: A308729