Dirichlet inverse of sigma_2 function (A001157).

Terms

a(0) =1a(1) =-5a(2) =-10a(3) =4a(4) =-26a(5) =50a(6) =-50a(7) =0a(8) =9a(9) =130a(10) =-122a(11) =-40a(12) =-170a(13) =250a(14) =260a(15) =0a(16) =-290a(17) =-45a(18) =-362a(19) =-104a(20) =500a(21) =610a(22) =-530a(23) =0a(24) =25a(25) =850a(26) =0a(27) =-200a(28) =-842a(29) =-1300