Expansion of Product_{k>=0} (1 + x^(3*k+1))/(1 - x^(3*k+1)).

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =4a(5) =6a(6) =6a(7) =8a(8) =12a(9) =14a(10) =16a(11) =22a(12) =28a(13) =32a(14) =40a(15) =50a(16) =58a(17) =70a(18) =86a(19) =100a(20) =118a(21) =144a(22) =168a(23) =194a(24) =232a(25) =272a(26) =312a(27) =366a(28) =428a(29) =490