Expansion of 1/sqrt(1-8x-8x^2).

Terms

a(0) =1a(1) =4a(2) =28a(3) =208a(4) =1624a(5) =13024a(6) =106336a(7) =879232a(8) =7338592a(9) =61699456a(10) =521753728a(11) =4433024512a(12) =37812715264a(13) =323603221504