OFFSET
1,3
FORMULA
Moebius transform of A006080(n+1).
MATHEMATICA
a[n_] := Sum[MoebiusMu[n/d] A006080[d + 1], {d, Divisors[n]}];
Array[a, 26] (* Jean-François Alcover, Aug 28 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Dec 13 2001
STATUS
approved