Expansion of (1-x^2)/((1-2*x)*(1+x^2)).

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =10a(5) =20a(6) =38a(7) =76a(8) =154a(9) =308a(10) =614a(11) =1228a(12) =2458a(13) =4916a(14) =9830a(15) =19660a(16) =39322a(17) =78644a(18) =157286a(19) =314572a(20) =629146a(21) =1258292a(22) =2516582a(23) =5033164a(24) =10066330a(25) =20132660a(26) =40265318a(27) =80530636a(28) =161061274a(29) =322122548