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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =13a(7) =18a(8) =29a(9) =39a(10) =57a(11) =77a(12) =112a(13) =148a(14) =205a(15) =271a(16) =372a(17) =484a(18) =647a(19) =838a(20) =1110a(21) =1423a(22) =1852a(23) =2361a(24) =3051a(25) =3857a(26) =4922a(27) =6191a(28) =7849a(29) =9805