Length of Collatz dropping time patterns in A186008.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =7a(6) =12a(7) =30a(8) =85a(9) =173a(10) =476a(11) =961a(12) =2652a(13) =8045a(14) =17637a(15) =51033a(16) =108950a(17) =312455a(18) =663535a(19) =1900470a(20) =5936673a(21) =13472296a(22) =39993895a(23) =87986917a(24) =257978502a(25) =820236724a(26) =1899474678a(27) =5723030586a(28) =12809477536a(29) =38036848410