Expansion of Product_{k>=1} (1 + x^(3*k)) / (1 - x^k).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =15a(7) =21a(8) =31a(9) =46a(10) =64a(11) =89a(12) =126a(13) =170a(14) =231a(15) =314a(16) =417a(17) =552a(18) =733a(19) =955a(20) =1244a(21) =1617a(22) =2079a(23) =2665a(24) =3413a(25) =4331a(26) =5485a(27) =6931a(28) =8704a(29) =10901