Expansion of Phi(x) = (1/(1+x))*Product_{k>=0} (1-(x/(1+x))^2^k).

Terms

a(0) =1a(1) =-2a(2) =2a(3) =0a(4) =-6a(5) =20a(6) =-48a(7) =96a(8) =-166a(9) =252a(10) =-340a(11) =416a(12) =-480a(13) =544a(14) =-544a(15) =0a(16) =2906a(17) =-13396a(18) =44100a(19) =-121792a(20) =296860a(21) =-652808a(22) =1306560a(23) =-2377280a(24) =3879136a(25) =-5461952a(26) =5892512a(27) =-2171520a(28) =-11699616a(29) =45871040