a(n) = n! * Sum_{k=1..n} sigma_k(k)/k.

A356437

a(n) = n! * Sum_{k=1..n} sigma_k(k)/k.

Terms

    a(0) =1a(1) =7a(2) =77a(3) =1946a(4) =84754a(5) =6202524a(6) =636369348a(7) =89979720144

External references