a(n) = -Sum_{d|n} phi(n/d) * (-n)^d.
A382997
a(n) = -Sum_{d|n} phi(n/d) * (-n)^d.
Terms
- a(0) =1a(1) =-2a(2) =33a(3) =-264a(4) =3145a(5) =-46500a(6) =823585a(7) =-16781408a(8) =387422001a(9) =-9999900360a(10) =285311670721
External references
- oeis: A382997