Expansion of phi(-q) / phi(-q^3) in powers of q where phi() is a Ramanujan theta function.

Terms

a(0) =1a(1) =-2a(2) =0a(3) =2a(4) =-2a(5) =0a(6) =4a(7) =-4a(8) =0a(9) =6a(10) =-8a(11) =0a(12) =10a(13) =-12a(14) =0a(15) =16a(16) =-18a(17) =0a(18) =24a(19) =-28a(20) =0a(21) =36a(22) =-40a(23) =0a(24) =52a(25) =-58a(26) =0a(27) =74a(28) =-84a(29) =0