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

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =0a(5) =2a(6) =-2a(7) =2a(8) =0a(9) =-4a(10) =8a(11) =-4a(12) =-26a(13) =112a(14) =-288a(15) =560a(16) =-832a(17) =782a(18) =274a(19) =-3378a(20) =9424a(21) =-17498a(22) =21182a(23) =-2154a(24) =-78180a(25) =284594a(26) =-700018a(27) =1381802a(28) =-2250316a(29) =2877674