Glaisher's chi numbers. a(n) = chi(4*n + 1).

Terms

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