Expansion of -(1+x^2)/((x^2+4*x+1)*(x^2-2*x-1)).

Terms

a(0) =1a(1) =-6a(2) =29a(3) =-124a(4) =501a(5) =-1962a(6) =7545a(7) =-28696a(8) =108393a(9) =-407662a(10) =1528981a(11) =-5724500a(12) =21408221a(13) =-80003026a(14) =298832369a(15) =-1115878064a(16) =4166011601a(17) =-15551383382a(18) =58047283725a(19) =-216656490156a(20) =808623915973