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

Terms

a(0) =1a(1) =6a(2) =14a(3) =44a(4) =150a(5) =532a(6) =1932a(7) =7128a(8) =26598a(9) =100100a(10) =379236a(11) =1444456a(12) =5525884a(13) =21217224a(14) =81719000a(15) =315583920a(16) =1221550470a(17) =4737927780a(18) =18409560180a(19) =71645805000a(20) =279227584020