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 A087971 #8 Jun 04 2024 01:26:33 %S A087971 2,8,40,80,9232,9232,3280,6560,29524,59048,1276936,1276936,6810136, %T A087971 6810136,21523360,43046720,1570824736,1570824736,1743392200, %U A087971 3486784400,17651846032,31381059608,141214768240,282429536480,9161049517720 %N A087971 Maximal term in Collatz-iteration started at 3^n-1. %H A087971 Amiram Eldar, <a href="/A087971/b087971.txt">Table of n, a(n) for n = 1..1000</a> %F A087971 a(n) = A025586(3^n-1). %Y A087971 Cf. A025586, A087701, A087972. %K A087971 nonn %O A087971 1,1 %A A087971 _Labos Elemer_, Sep 24 2003