Expansion of (1 - sqrt(1 - 4*x - 12*x^2))/(2*x).

Terms

a(0) =1a(1) =4a(2) =8a(3) =32a(4) =128a(5) =576a(6) =2688a(7) =13056a(8) =65024a(9) =330752a(10) =1710080a(11) =8962048a(12) =47497216a(13) =254132224a(14) =1370849280a(15) =7447117824a(16) =40707293184a(17) =223731253248