Length of longest chain of nonempty proper subsemigroups of the monoid of partial injective order-preserving functions of a chain with n elements.

A242429

Length of longest chain of nonempty proper subsemigroups of the monoid of partial injective order-preserving functions of a chain with n elements.

Terms

    a(0) =1a(1) =5a(2) =17a(3) =53a(4) =167a(5) =550a(6) =1899a(7) =6809a(8) =25067a(9) =93902a(10) =355775a(11) =1358208a(12) =5212573a(13) =20082860a(14) =77607895a(15) =300638481a(16) =1166999699a(17) =4537960846a(18) =17673418311a(19) =68924837252a(20) =269132082925

External references