a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k).
A205812
a(n) = Sum_{k=1..n} binomial(n,k) * sigma(n,k).
Terms
- a(0) =1a(1) =11a(2) =70a(3) =719a(4) =7806a(5) =122534a(6) =2097278a(7) =43444159a(8) =1000262653a(9) =25997950846a(10) =743008372734
External references
- oeis: A205812