a(n) = Sum_{d|n} phi(n/d) * (-n)^(d-1).
A382998
a(n) = Sum_{d|n} phi(n/d) * (-n)^(d-1).
Terms
- a(0) =1a(1) =-1a(2) =11a(3) =-66a(4) =629a(5) =-7750a(6) =117655a(7) =-2097676a(8) =43046889a(9) =-999990036a(10) =25937424611a(11) =-743008622708
External references
- oeis: A382998