Expansion of (1/2)*(1-sqrt(1-8*x)/sqrt(1-4*x)).

Terms

a(0) =0a(1) =1a(2) =5a(3) =26a(4) =141a(5) =798a(6) =4706a(7) =28820a(8) =182461a(9) =1188406a(10) =7926102a(11) =53910828a(12) =372671250a(13) =2610977388a(14) =18498911268a(15) =132310178472a(16) =953981219997