a(n) = Sum_{k=1..n} k * sigma_{n-1}(k).

A356129

a(n) = Sum_{k=1..n} k * sigma_{n-1}(k).

Terms

    a(0) =1a(1) =7a(2) =41a(3) =395a(4) =4503a(5) =68969a(6) =1205345a(7) =24831145a(8) =574932340a(9) =14936279962a(10) =427782949566

External references