Expansion of Product_{n>=1} (1 - x^(3*n))/(1 - x^n)^2 in powers of x.

Terms

a(0) =1a(1) =2a(2) =5a(3) =9a(4) =18a(5) =31a(6) =54a(7) =88a(8) =144a(9) =225a(10) =351a(11) =531a(12) =800a(13) =1179a(14) =1728a(15) =2492a(16) =3573a(17) =5058a(18) =7119a(19) =9918a(20) =13743a(21) =18882a(22) =25810a(23) =35028a(24) =47313a(25) =63513a(26) =84883a(27) =112833a(28) =149373a(29) =196803