OFFSET
1,5
FORMULA
a(n) = Sum_{i=1..floor((n-1)/2)} mu(n-2i)^2, where mu is the Möbius function (A008683).
MATHEMATICA
Table[Sum[(MoebiusMu[(n - 2 i)]^2), {i, Floor[(n-1)/2]}], {n, 100}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Apr 10 2018
STATUS
approved