OFFSET
1,2
FORMULA
a(n) = Sum_{d|n} mu(n/d) * d^n * tau(d), where mu is the Moebius function A008683.
PROG
(PARI) a(n) = sumdiv(n, d, moebius(n/d)*d^n*numdiv(d));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 17 2024
STATUS
approved