The number of indecomposable n-permutations that have only cycles of length 3 or less.
A211371
The number of indecomposable n-permutations that have only cycles of length 3 or less.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =3a(4) =7a(5) =29a(6) =131a(7) =585a(8) =3083a(9) =17089a(10) =97987a(11) =607977a(12) =3926731a(13) =26344001a(14) =185908739a(15) =1358432937a(16) =10279616891a(17) =80819893393a(18) =655374770131
External references
- oeis: A211371