Expansion of (1 - x + 5x^2)/((1-x)*(1-2x)).

Terms

a(0) =1a(1) =2a(2) =9a(3) =23a(4) =51a(5) =107a(6) =219a(7) =443a(8) =891a(9) =1787a(10) =3579a(11) =7163a(12) =14331a(13) =28667a(14) =57339a(15) =114683a(16) =229371a(17) =458747a(18) =917499a(19) =1835003a(20) =3670011a(21) =7340027a(22) =14680059a(23) =29360123a(24) =58720251a(25) =117440507a(26) =234881019a(27) =469762043a(28) =939524091a(29) =1879048187