Generalized sum of divisors function: third diagonal of A060044.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =10a(5) =-11a(6) =12a(7) =-21a(8) =31a(9) =-13a(10) =23a(11) =-42a(12) =42a(13) =-42a(14) =43a(15) =22a(16) =-14a(17) =33a(18) =-126a(19) =185a(20) =-273a(21) =406a(22) =-387a(23) =637a(24) =-945a(25) =1092a(26) =-1389a(27) =1841a(28) =-2358a(29) =2852