Expansion of Product_{k>=1} ((1 + x^(4*k)) / (1 - x^k)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =13a(7) =18a(8) =28a(9) =38a(10) =55a(11) =74a(12) =106a(13) =140a(14) =192a(15) =253a(16) =342a(17) =444a(18) =588a(19) =758a(20) =992a(21) =1267a(22) =1634a(23) =2072a(24) =2650a(25) =3334a(26) =4218a(27) =5276a(28) =6627a(29) =8234