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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =16a(7) =22a(8) =33a(9) =50a(10) =70a(11) =98a(12) =143a(13) =193a(14) =266a(15) =368a(16) =493a(17) =659a(18) =892a(19) =1170a(20) =1543a(21) =2035a(22) =2642a(23) =3422a(24) =4448a(25) =5694a(26) =7294a(27) =9334a(28) =11839a(29) =14982