Expansion of x * f(-x^7) * f(-x^21) / (f(-x) * f(-x^3)) where f() is a Ramanujan theta function.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =16a(7) =21a(8) =32a(9) =48a(10) =66a(11) =92a(12) =134a(13) =177a(14) =243a(15) =334a(16) =441a(17) =585a(18) =788a(19) =1018a(20) =1334a(21) =1746a(22) =2240a(23) =2877a(24) =3715a(25) =4698a(26) =5972a(27) =7582a(28) =9517a(29) =11940