Expansion of 1 / (chi(x) * chi(x^7)) in powers of x where chi() is a Ramanujan theta function.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =2a(5) =-3a(6) =4a(7) =-6a(8) =7a(9) =-9a(10) =12a(11) =-14a(12) =18a(13) =-22a(14) =28a(15) =-34a(16) =41a(17) =-50a(18) =60a(19) =-72a(20) =86a(21) =-105a(22) =124a(23) =-146a(24) =174a(25) =-204a(26) =240a(27) =-282a(28) =332a(29) =-386