Number of permutations of 5..n+4 with no element divisible by an adjacent element.
A178848
Number of permutations of 5..n+4 with no element divisible by an adjacent element.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =480a(6) =3600a(7) =23040a(8) =221760a(9) =1895040a(10) =17942400a(11) =195229440a(12) =2726760960a(13) =29650279680a(14) =479288355840
External references
- oeis: A178848