Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a<b<c.
A212419
Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a<b<c.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =21a(5) =116a(6) =713a(7) =5030a(8) =40301a(9) =362852a(10) =3628744a(11) =39916716a(12) =479001426a(13) =6227020536a(14) =87178290639
External references
- oeis: A212419