Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> cba where a<b<c.
A212418
Size of the equivalence class of S_n containing the identity permutation under transformations of positionally adjacent elements of the form abc <--> acb <--> cba where a<b<c.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =54a(6) =285a(7) =2160a(8) =15825a(9) =151200a(10) =1411095a(11) =16329600a(12) =185067855a(13) =2514758400a(14) =33530101605a(15) =523069747200
External references
- oeis: A212418