a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} (-1)^(d+1)/(d * (k/d)!) )/(n-k)!.
A354509
a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} (-1)^(d+1)/(d * (k/d)!) )/(n-k)!.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =5a(4) =5a(5) =-8a(6) =560a(7) =-5997a(8) =-14765a(9) =176826a(10) =5206410a(11) =-42491623a(12) =-427057527a(13) =-412183484a(14) =147180377804a(15) =-569782989113
External references
- oeis: A354509