OFFSET
1,2
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
G.f. A(x) satisfies: A(x) = x - 2^2 * A(x^2) - 3^2 * A(x^3) - 4^2 * A(x^4) - ...
a(1) = 1; a(n) = -n^2 * Sum_{d|n, d < n} a(d) / d^2.
a(n) = mu(n) * n^2.
Multiplicative with a(p^e) = -p^2 if e = 1 and 0 otherwise. - Amiram Eldar, Oct 25 2020
MATHEMATICA
Table[MoebiusMu[n] n^2, {n, 61}]
CROSSREFS
KEYWORD
sign,mult,easy
AUTHOR
Ilya Gutkovskiy, May 07 2020
STATUS
approved