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

Terms

a(0) =1a(1) =3a(2) =6a(3) =12a(4) =24a(5) =45a(6) =78a(7) =132a(8) =222a(9) =363a(10) =576a(11) =900a(12) =1392a(13) =2121a(14) =3180a(15) =4716a(16) =6936a(17) =10098a(18) =14550a(19) =20796a(20) =29520a(21) =41595a(22) =58176a(23) =80856a(24) =111750a(25) =153561a(26) =209820a(27) =285240a(28) =385968a(29) =519840