The order of the semigroup of orientation-preserving partial transformations on n elements.
A289713
The order of the semigroup of orientation-preserving partial transformations on n elements.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =61a(4) =449a(5) =3161a(6) =21145a(7) =136529a(8) =862209a(9) =5369617a(10) =33133481a(11) =203119577a(12) =1239049729a(13) =7528608985a(14) =45596026169a(15) =275385806881
External references
- oeis: A289713