a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k) * (-1)^(n-k).
A206764
a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k) * (-1)^(n-k).
Terms
- a(0) =1a(1) =-1a(2) =10a(3) =79a(4) =1026a(5) =15686a(6) =279938a(7) =5771359a(8) =134218243a(9) =3487832974a(10) =100000000002
External references
- oeis: A206764