The order of the semigroup of orientation-preserving or reserving partial transformations of n elements.

A289717

The order of the semigroup of orientation-preserving or reserving partial transformations of n elements.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =64a(4) =549a(5) =4566a(6) =34711a(7) =243944a(8) =1622025a(9) =10402858a(10) =65219931a(11) =403119036a(12) =2469129229a(13) =15032191422a(14) =91123985023a(15) =550590488656

External references