a(n) is the sum over each permutation of S_n of the least element of the descent set.
A319013
a(n) is the sum over each permutation of S_n of the least element of the descent set.
Terms
- a(0) =0a(1) =1a(2) =7a(3) =37a(4) =201a(5) =1231a(6) =8653a(7) =69273a(8) =623521a(9) =6235291a(10) =68588301a(11) =823059733a(12) =10699776673a(13) =149796873591
External references
- oeis: A319013