Period of the continued fraction for sqrt(3^(2n+1)).

Terms

a(0) =2a(1) =10a(2) =30a(3) =98a(4) =270a(5) =818a(6) =2382a(7) =7282a(8) =21818a(9) =65650a(10) =196406a(11) =589982a(12) =1768938a(13) =5309294a(14) =15924930a(15) =47779238a(16) =143322850a(17) =429998586a(18) =1289970842a(19) =3869957114a(20) =11609762666a(21) =34829416842a(22) =104488103446