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

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =8a(5) =11a(6) =20a(7) =27a(8) =44a(9) =60a(10) =92a(11) =124a(12) =183a(13) =244a(14) =348a(15) =461a(16) =640a(17) =840a(18) =1144a(19) =1488a(20) =1992a(21) =2572a(22) =3393a(23) =4348a(24) =5668a(25) =7212a(26) =9301a(27) =11760a(28) =15024a(29) =18880