Length of longest chain of nonempty proper subsemigroups of the monoid of partial injective orientation-preserving functions of a chain with n elements.
A242432
Length of longest chain of nonempty proper subsemigroups of the monoid of partial injective orientation-preserving functions of a chain with n elements.
Terms
- a(0) =1a(1) =6a(2) =24a(3) =92a(4) =363a(5) =1483a(6) =6191a(7) =26077a(8) =109987a(9) =462900a(10) =1941613a(11) =8115138a(12) =33805905a(13) =140413073a(14) =581694265a(15) =2404314784a(16) =9917782935a(17) =40837958578a(18) =167889571658a(19) =689231516287
External references
- oeis: A242432