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 A087970 #11 Jun 04 2024 01:26:37 %S A087970 2,16,16,52,52,100,196,9232,9232,1540,3076,9232,12292,24580,49156, %T A087970 98308,196612,393220,786436,1572868,3145732,6291460,12582916,25165828, %U A087970 50331652,100663300,201326596,402653188,805306372,1610612740,3221225476,6442450948,12884901892 %N A087970 Maximal term in Collatz-iteration started at 2^n+1. %H A087970 Amiram Eldar, <a href="/A087970/b087970.txt">Table of n, a(n) for n = 0..1000</a> %F A087970 a(n) = A025586(2^n+1). %Y A087970 Cf. A000051, A025586, A087701, A087972. %K A087970 nonn %O A087970 0,1 %A A087970 _Labos Elemer_, Sep 24 2003 %E A087970 Offset changed to 0, a(0) prepended and more terms added by _Amiram Eldar_, Jun 04 2024