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

Terms

a(0) =1a(1) =2a(2) =8a(3) =36a(4) =176a(5) =912a(6) =4928a(7) =27472a(8) =156864a(9) =912832a(10) =5394176a(11) =32282240a(12) =195264000a(13) =1191825920a(14) =7331457024a(15) =45406194944a(16) =282896763904