Expansion of sqrt((1-3*x) / (1-7*x)^3).

Terms

a(0) =1a(1) =9a(2) =75a(3) =599a(4) =4659a(5) =35595a(6) =268485a(7) =2005785a(8) =14873715a(9) =109643195a(10) =804354417a(11) =5877232773a(12) =42798735805a(13) =310767250773