Expansion of e.g.f. Sum_{k>=1} sigma(k)*(exp(x) - 1)^k/k!, where sigma = sum of divisors (A000203).
A308555
Expansion of e.g.f. Sum_{k>=1} sigma(k)*(exp(x) - 1)^k/k!, where sigma = sum of divisors (A000203).
Terms
- a(0) =1a(1) =4a(2) =14a(3) =53a(4) =222a(5) =1011a(6) =4944a(7) =25884a(8) =144963a(9) =865556a(10) =5477661a(11) =36518635a(12) =255323564a(13) =1867122987a(14) =14259709474a(15) =113593734317a(16) =942317654779
External references
- oeis: A308555