3x+1 sequence beginning at 3.

Terms

a(0) =3a(1) =10a(2) =5a(3) =16a(4) =8a(5) =4a(6) =2a(7) =1a(8) =4a(9) =2a(10) =1a(11) =4a(12) =2a(13) =1a(14) =4a(15) =2a(16) =1a(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