Generalized sum of divisors function.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =3a(4) =-2a(5) =1a(6) =-5a(7) =23a(8) =-25a(9) =27a(10) =-49a(11) =74a(12) =-62a(13) =85a(14) =-132a(15) =165a(16) =-195a(17) =229a(18) =-240a(19) =325a(20) =-374a(21) =379a(22) =-469a(23) =553a(24) =-590a(25) =746a(26) =-805a(27) =854a(28) =-1000a(29) =1085