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

Terms

a(0) =1a(1) =3a(2) =7a(3) =19a(4) =46a(5) =119a(6) =296a(7) =753a(8) =1891a(9) =4784a(10) =12052a(11) =30435a(12) =76752a(13) =193708a(14) =488664a(15) =1233061a(16) =3110965a(17) =7849501a(18) =19804697a(19) =49969640a(20) =126077463a(21) =318106522a(22) =802611677a(23) =2025068125a(24) =5109437370a(25) =12891603348a(26) =32526741151a(27) =82068086418a(28) =207065613652a(29) =522446355976