Glaisher's chi_4(n).

Terms

a(0) =1a(1) =-4a(2) =0a(3) =16a(4) =-14a(5) =0a(6) =0a(7) =-64a(8) =81a(9) =56a(10) =0a(11) =0a(12) =-238a(13) =0a(14) =0a(15) =256a(16) =322a(17) =-324a(18) =0a(19) =-224a(20) =0a(21) =0a(22) =0a(23) =0a(24) =-429a(25) =952a(26) =0a(27) =0a(28) =82a(29) =0