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

Terms

a(0) =1a(1) =6a(2) =22a(3) =92a(4) =358a(5) =1460a(6) =5756a(7) =23288a(8) =92294a(9) =372036a(10) =1478420a(11) =5947272a(12) =23671516a(13) =95102088a(14) =378922552a(15) =1521039088a(16) =6064766662a(17) =24329781988a(18) =97059838372a(19) =389194630888