a(n) = Sum_{k=1..n} mu(k)*k^2.

Terms

a(0) =1a(1) =-3a(2) =-12a(3) =-12a(4) =-37a(5) =-1a(6) =-50a(7) =-50a(8) =-50a(9) =50a(10) =-71a(11) =-71a(12) =-240a(13) =-44a(14) =181a(15) =181a(16) =-108a(17) =-108a(18) =-469a(19) =-469a(20) =-28a(21) =456a(22) =-73a(23) =-73a(24) =-73a(25) =603a(26) =603a(27) =603a(28) =-238a(29) =-1138