a(n) = Sum_{k=1..n} mu(k)*k^3.

Terms

a(0) =1a(1) =-7a(2) =-34a(3) =-34a(4) =-159a(5) =57a(6) =-286a(7) =-286a(8) =-286a(9) =714a(10) =-617a(11) =-617a(12) =-2814a(13) =-70a(14) =3305a(15) =3305a(16) =-1608a(17) =-1608a(18) =-8467a(19) =-8467a(20) =794a(21) =11442a(22) =-725a(23) =-725a(24) =-725a(25) =16851a(26) =16851a(27) =16851a(28) =-7538a(29) =-34538