Sum(mu(i)*phi(j): i+j=n), with mu=A008683 and phi=A000010.

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =-1a(5) =-1a(6) =-4a(7) =-2a(8) =-5a(9) =-8a(10) =-5a(11) =-8a(12) =-9a(13) =-11a(14) =-10a(15) =-24a(16) =1a(17) =-21a(18) =-11a(19) =-23a(20) =-15a(21) =-37a(22) =4a(23) =-42a(24) =-11a(25) =-38a(26) =-7a(27) =-49a(28) =6a(29) =-63