Number of Abelian groups of order n minus the number of non-Abelian groups of order n.

Terms

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