Length of longest chain of nonempty proper subsemigroups of the symmetric inverse monoid.

A227914

Length of longest chain of nonempty proper subsemigroups of the symmetric inverse monoid.

Terms

    a(0) =1a(1) =6a(2) =25a(3) =116a(4) =722a(5) =5956a(6) =59243a(7) =667500a(8) =8296060a(9) =112406158a(10) =1648441865a(11) =26016230581a(12) =439698829588

External references