a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * sigma_1(k) * a(n-k).
A340904
a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * sigma_1(k) * a(n-k).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =28a(4) =225a(5) =2206a(6) =26174a(7) =361278a(8) =5704401a(9) =101297701a(10) =1998893240a(11) =43386854622
External references
- oeis: A340904