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) =6a(6) =18a(7) =38a(8) =68a(9) =108a(10) =148a(11) =148a(12) =-2a(13) =-552a(14) =-2004a(15) =-5280a(16) =-11960a(17) =-24590a(18) =-46990a(19) =-84254a(20) =-141476a(21) =-218654a(22) =-295794a(23) =-295374a(24) =3540a(25) =1148110a(26) =4378918a(27) =12332318a(28) =30327568a(29) =68633710