Expansion of (1 - sqrt(1 - 4*x - 16*x^2))/(2*x).

Terms

a(0) =1a(1) =5a(2) =10a(3) =45a(4) =190a(5) =930a(6) =4660a(7) =24445a(8) =131190a(9) =719830a(10) =4013260a(11) =22684370a(12) =129661740a(13) =748252580a(14) =4353379560a(15) =25508284445a(16) =150392391590a(17) =891549228430