This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A186009 #14 Aug 16 2025 21:14:48 %S A186009 1,1,1,2,3,7,12,30,85,173,476,961,2652,8045,17637,51033,108950,312455, %T A186009 663535,1900470,5936673,13472296,39993895,87986917,257978502, %U A186009 820236724,1899474678,5723030586,12809477536,38036848410,84141805077,248369601964 %N A186009 Length of Collatz dropping time patterns in A186008. %C A186009 This is A100982 with 1 prepended. %H A186009 <a href="/index/3#3x1">Index entries for sequences related to 3x+1 (or Collatz) problem</a> %Y A186009 Cf. A100982, A186008. %K A186009 nonn %O A186009 1,4 %A A186009 _T. D. Noe_, Feb 09 2011