Expansion of (phi(q^3) / phi(q))^2 in powers of q where phi() is a Ramanujan theta function.

Terms

a(0) =1a(1) =-4a(2) =12a(3) =-28a(4) =60a(5) =-120a(6) =228a(7) =-416a(8) =732a(9) =-1252a(10) =2088a(11) =-3408a(12) =5460a(13) =-8600a(14) =13344a(15) =-20424a(16) =30876a(17) =-46152a(18) =68268a(19) =-100016a(20) =145224a(21) =-209120a(22) =298800a(23) =-423840a(24) =597108a(25) =-835804a(26) =1162824a(27) =-1608508a(28) =2212896a(29) =-3028632