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

A321438

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

Terms

    a(0) =1a(1) =3a(2) =28a(3) =239a(4) =3126a(5) =45990a(6) =823544a(7) =16711423a(8) =387440173a(9) =9990235398a(10) =285311670612

External references