Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> bac where a<b<c.
A212417
Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> bac where a<b<c.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =35a(6) =135a(7) =945a(8) =5193a(9) =46737a(10) =336825a(11) =3705075
External references
- oeis: A212417