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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =16a(5) =44a(6) =122a(7) =342a(8) =966a(9) =2746a(10) =7846a(11) =22514a(12) =64836a(13) =187288a(14) =542438a(15) =1574666a(16) =4580400a(17) =13347324a(18) =38956182a(19) =113861922a(20) =333226560a(21) =976353876a(22) =2863756158a(23) =8407877394a(24) =24707200854a(25) =72663608178a(26) =213864889770a(27) =629893319902