Trajectory of 3 under map n->15n+1 if n odd, n->n/2 if n even.

Terms

a(0) =3a(1) =46a(2) =23a(3) =346a(4) =173a(5) =2596a(6) =1298a(7) =649a(8) =9736a(9) =4868a(10) =2434a(11) =1217a(12) =18256a(13) =9128a(14) =4564a(15) =2282a(16) =1141a(17) =17116a(18) =8558a(19) =4279a(20) =64186a(21) =32093a(22) =481396a(23) =240698a(24) =120349a(25) =1805236a(26) =902618a(27) =451309a(28) =6769636a(29) =3384818