The order of the semigroup of orientation-preserving or reserving full transformations of n elements.
A289718
The order of the semigroup of orientation-preserving or reserving full transformations of n elements.
Terms
- a(0) =1a(1) =4a(2) =27a(3) =180a(4) =1015a(5) =5028a(6) =23051a(7) =101272a(8) =434835a(9) =1843320a(10) =7753471a(11) =32440884a(12) =135195307a(13) =561615460a(14) =2326740315a(15) =9617256944a(16) =39671268187a(17) =163352387952a(18) =671559953015
External references
- oeis: A289718