a(n) = Sum_{d|n} phi(n/d)^(n+d+1).

A342620

a(n) = Sum_{d|n} phi(n/d)^(n+d+1).

Terms

    a(0) =1a(1) =2a(2) =33a(3) =66a(4) =16385a(5) =770a(6) =10077697a(7) =1050626a(8) =362805249a(9) =83886082a(11) =268664834

External references