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

Terms

a(0) =1a(1) =3a(2) =12a(3) =36a(4) =96a(5) =240a(6) =576a(7) =1344a(8) =3072a(9) =6912a(10) =15360a(11) =33792a(12) =73728a(13) =159744a(14) =344064a(15) =737280a(16) =1572864a(17) =3342336a(18) =7077888a(19) =14942208a(20) =31457280a(21) =66060288a(22) =138412032a(23) =289406976a(24) =603979776a(25) =1258291200a(26) =2617245696a(27) =5435817984a(28) =11274289152a(29) =23353884672