Numbers with exactly 3 odd integers in their Collatz (or 3x+1) trajectory.

Terms

a(0) =3a(1) =6a(2) =12a(3) =13a(4) =24a(5) =26a(6) =48a(7) =52a(8) =53a(9) =96a(10) =104a(11) =106a(12) =113a(13) =192a(14) =208a(15) =212a(16) =213a(17) =226a(18) =227a(19) =384a(20) =416a(21) =424a(22) =426a(23) =452a(24) =453a(25) =454a(26) =768a(27) =832a(28) =848a(29) =852