a(n) = n! * Sum_{d|n} (-1)^(n - d) / (n/d)!.
A327243
a(n) = n! * Sum_{d|n} (-1)^(n - d) / (n/d)!.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =35a(4) =121a(5) =479a(6) =5041a(7) =62159a(8) =423361a(9) =1844639a(10) =39916801a(11) =779042879a(12) =6227020801a(13) =43606442879
External references
- oeis: A327243