Generalized sum of divisors function: second diagonal of A060184.

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =1a(5) =1a(6) =1a(7) =6a(8) =-1a(9) =5a(10) =-3a(11) =10a(12) =0a(13) =9a(14) =-7a(15) =16a(16) =-9a(17) =17a(18) =-6a(19) =22a(20) =-13a(21) =20a(22) =-15a(23) =28a(24) =-14a(25) =35a(26) =-23a(27) =36a(28) =-25a(29) =36