OFFSET
1,1
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..50
FORMULA
a(n) = (1/n)*Sum_{d|n} 2^(d^2)*moebius(n/d).
a(n) ~ 2^(n^2) / n. - Vaclav Kotesovec, Oct 09 2019
MATHEMATICA
Table[Sum[2^(d^2)*MoebiusMu[n/d], {d, Divisors[n]}]/n, {n, 1, 12}] (* Vaclav Kotesovec, Oct 09 2019 *)
PROG
(PARI) a(n)={sumdiv(n, d, 2^(d^2)*moebius(n/d))/n} \\ Andrew Howroyd, Jan 08 2020
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul D. Hanna, Vladeta Jovovic, Apr 02 2009
EXTENSIONS
Terms a(12) and beyond from Andrew Howroyd, Jan 08 2020
STATUS
approved