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

Terms

a(0) =2a(1) =5a(2) =11a(3) =23a(4) =46a(5) =92a(6) =184a(7) =368a(8) =736a(9) =1472a(10) =2944a(11) =5888a(12) =11776a(13) =23552a(14) =47104a(15) =94208a(16) =188416a(17) =376832a(18) =753664a(19) =1507328a(20) =3014656a(21) =6029312a(22) =12058624a(23) =24117248a(24) =48234496a(25) =96468992a(26) =192937984a(27) =385875968a(28) =771751936a(29) =1543503872