3x+1 sequence beginning at 9.

Terms

a(0) =9a(1) =28a(2) =14a(3) =7a(4) =22a(5) =11a(6) =34a(7) =17a(8) =52a(9) =26a(10) =13a(11) =40a(12) =20a(13) =10a(14) =5a(15) =16a(16) =8a(17) =4a(18) =2a(19) =1a(20) =4a(21) =2a(22) =1a(23) =4a(24) =2a(25) =1a(26) =4a(27) =2a(28) =1a(29) =4