Max odd N reached by Collatz sequence "record setters".

Terms

a(0) =1a(1) =5a(2) =17a(3) =53a(4) =3077a(5) =83501a(6) =425645a(7) =2270045a(8) =2717873a(9) =9038141a(10) =35452673a(11) =197759717a(12) =523608245a(13) =827370449a(14) =5734125917a(15) =46548912269a(16) =117539270981a(17) =207572633873a(18) =286185056525a(19) =439600764977a(20) =804164538869