Length of longest chain of nonempty proper subsemigroups of the dual symmetric inverse monoid.
A242428
Length of longest chain of nonempty proper subsemigroups of the dual symmetric inverse monoid.
Terms
- a(0) =0a(1) =2a(2) =17a(3) =180a(4) =3298a(5) =88431a(6) =3064050a(7) =130905678a(8) =6732227475a(9) =409094032964
External references
- oeis: A242428