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

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =24a(5) =60a(6) =148a(7) =370a(8) =920a(9) =2300a(10) =5736a(11) =14340a(12) =35808a(13) =89520a(14) =223668a(15) =559170a(16) =1397496a(17) =3493740a(18) =8732920a(19) =21832300a(20) =54575888a(21) =136439720a(22) =341082504a(23) =852706260a(24) =2131706864a(25) =5329267160a(26) =13322959888a(27) =33307399720a(28) =83267756400a(29) =208169391000