Expansion of Product_{k>=0} 1/(1 - x^(3*k+1))^2.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =10a(6) =13a(7) =18a(8) =26a(9) =34a(10) =44a(11) =58a(12) =76a(13) =96a(14) =123a(15) =156a(16) =196a(17) =244a(18) =304a(19) =374a(20) =461a(21) =566a(22) =690a(23) =836a(24) =1015a(25) =1224a(26) =1470a(27) =1762a(28) =2110a(29) =2512