Number of sub-monoids of the monoid of uniform block permutations of size n that contain the symmetric group S_n.
A371505
Number of sub-monoids of the monoid of uniform block permutations of size n that contain the symmetric group S_n.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =6a(4) =10a(5) =31a(6) =63a(7) =287a(8) =1099a(9) =8640a(10) =62658a(11) =1546891a(12) =29789119a(13) =2525655957
External references
- oeis: A371505