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

Terms

a(0) =1a(1) =2a(2) =0a(3) =8a(4) =-2a(5) =8a(6) =16a(7) =8a(8) =8a(9) =10a(10) =80a(11) =-8a(12) =72a(13) =-24a(14) =144a(15) =128a(16) =134a(17) =40a(18) =224a(19) =120a(20) =232a(21) =688a(22) =176a(23) =696a(24) =32a(25) =1194a(26) =-96a(27) =1840a(28) =1144a(29) =2248