Expansion of 1/sqrt(1 - 4*x - 8*x^4).

Terms

a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =276a(6) =1044a(7) =3992a(8) =15414a(9) =59948a(10) =234484a(11) =921432a(12) =3634916a(13) =14386248a(14) =57097704a(15) =227166384a(16) =905714150a(17) =3617851980a(18) =14475452484a(19) =58004111160a(20) =232737175404a(21) =934969613528