a(n) = Sum_{k|n} k!*mu(k), where mu() is the Moebius function.
A099740
a(n) = Sum_{k|n} k!*mu(k), where mu() is the Moebius function.
Terms
- a(0) =1a(1) =-1a(2) =-5a(3) =-1a(4) =-119a(5) =713a(6) =-5039a(7) =-1a(8) =-5a(9) =3628679a(10) =-39916799a(11) =713a(12) =-6227020799a(13) =87178286159a(15) =-1a(17) =713a(19) =3628679a(23) =713a(24) =-119
External references
- oeis: A099740