Kendall-Mann numbers: the most common number of inversions in a permutation on n letters is floor(n*(n-1)/4); a(n) is the number of permutations with this many inversions.
A000140
Kendall-Mann numbers: the most common number of inversions in a permutation on n letters is floor(n*(n-1)/4); a(n) is the number of permutations with this many inversions.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =101a(6) =573a(7) =3836a(8) =29228a(9) =250749a(10) =2409581a(11) =25598186a(12) =296643390a(13) =3727542188a(14) =50626553988a(15) =738680521142
External references
- oeis: A000140