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