Expansion of (sqrt(1+3*x) + sqrt(1-x))/(2*sqrt(1-x)).

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =-1a(5) =3a(6) =-6a(7) =15a(8) =-36a(9) =91a(10) =-232a(11) =603a(12) =-1585a(13) =4213a(14) =-11298a(15) =30537a(16) =-83097a(17) =227475a(18) =-625992a(19) =1730787a(20) =-4805595a(21) =13393689a(22) =-37458330a(23) =105089229a(24) =-295673994a(25) =834086421a(26) =-2358641376a(27) =6684761125a(28) =-18985057351a(29) =54022715451