Generalized sum of divisors function: third diagonal of A060184.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =5a(5) =-1a(6) =5a(7) =-2a(8) =9a(9) =3a(10) =9a(11) =-2a(12) =14a(13) =-1a(14) =15a(15) =10a(16) =15a(17) =7a(18) =11a(19) =14a(20) =10a(21) =26a(22) =20a(23) =28a(24) =2a(25) =41a(26) =-5a(27) =63a(28) =-21a(29) =82